The United States is reluctantly but decisively becoming engaged in the civil wars in Iraq and Syria as it seeks to combat Isis, which calls itself Islamic State.

President Barack Obama will outline his plans in a speech today to create a grand coalition of Western and regional powers to contain and defeat Isis, which has established a quasi-state stretching from the frontiers of Iran to the outskirts of Aleppo.

The US is encouraged by the formation on Monday of what it sees as a more inclusive government in Iraq under Haider al-Abadi, the new Prime Minister. He replaces Nouri al-Maliki who, in his eight years in office, became a hate figure for the Sunni minority as the architect of Shia dominance and arbitrary power. Mr Maliki’s government was notoriously corrupt and dysfunctional, its 350,000-strong army routed in June by a few thousand Isis fighters in northern and western Iraq. Fear of Isis has led former rivals and opponents such as the US and Iran, Kurdish parties and Shia and Sunni politicians in Baghdad, to sink some of their differences, though these have not gone away.

Mr Obama said after the Nato summit in Wales last week that “we are going to have to find effective partners on the ground to push back against Isil”, using the US government’s preferred name for Isis. But in seeking such partners in Iraq and Syria, the US will be taking sides in complex sectarian and ethnic struggles. Kamran Karadaghi, a Kurdish commentator and adviser to the former President Jalal Talabani, said: “It is still a sectarian government in Baghdad and Abadi had his ministers chosen for him by the different parties.” He says the Kurds were pressured into agreeing to join it by the US and UN envoys sitting in on a decision-making meeting in Sulaymaniyah in the Kurdish region, though the main Kurdish demands have not been met. Among issues at stake are the sale of Kurdish oil, the future of Kirkuk and the central government’s payment of the Kurdish share of Iraq’s oil revenues. Mr Karadaghi says: “So far we have got nothing except some promises over payment of salaries.”

In pictures: The rise of Isis Show all 74 1 /74 In pictures: The rise of Isis In pictures: The rise of Isis Isis fighters Fighters of the Islamic State wave the group's flag from a damaged display of a government fighter jet following the battle for the Tabqa air base, in Raqqa, Syria AP In pictures: The rise of Isis Isis fighters Fighters from Islamic State group sit on their tank during a parade in Raqqa, Syria AP In pictures: The rise of Isis Isis fighters Fighters from the Islamic State group pray at the Tabqa air base after capturing it from the Syrian government in Raqqa, Syria AP In pictures: The rise of Isis Isis fighters Fighters from extremist Islamic State group parade in Raqqa, Syria AP In pictures: The rise of Isis Isis kidnapping A video uploaded to social networks shows men in underwear being marched barefoot along a desert road before being allegedly executed by Isis Getty Images In pictures: The rise of Isis Isis kidnapping Haruna Yukawa after his capture by Isis In pictures: The rise of Isis Isis kidnapping Khalinda Sharaf Ajour, a Yazidi, says two of her daughters were captured by Isis militants Washington Post In pictures: The rise of Isis Isis fighters Spokesperson for Isis Vice News via Youtube In pictures: The rise of Isis A pro-Isis leaflet A pro-Isis leaflet handed out on Oxford Street In London Ghaffar Hussain In pictures: The rise of Isis Isis fighters Isis Jihadists burn their passports In pictures: The rise of Isis Isis controls Syrian Aid A man collecting aid administered by Isis in Syria In pictures: The rise of Isis Isis controls Syrian Aid A woman collecting aid administered by Isis in Syria In pictures: The rise of Isis Isis controls Syrian Aid Local civilians queue for aid administered by Isis. Since it declared a caliphate the group has increasingly been delivering services such as healthcare, and distributing aid and free fuel In pictures: The rise of Isis Iraq crisis Iraqi security forces detain men suspected of being militants of the Isis group in Diyala province In pictures: The rise of Isis Iraq crisis Mourners carry the coffin of a Shi'ite volunteer from the brigades of peace, who joined the Iraqi army and was killed during clashes with militants of the Isis group in Samarra, during his funeral in Najaf In pictures: The rise of Isis Iraqi refugees An Iraqi Shiite Turkmen family fleeing the violence in the Iraqi city of Tal Afar, west of Mosul, arrives at a refugee camp on the outskirts of Arbil, in Iraq's Kurdistan region In pictures: The rise of Isis Isis leader Abu Bakr al-Baghdadi A photograph made from a video by the jihadist affiliated group Furqan Media via their twitter account allegedly showing Isis leader Abu Bakr al-Baghdadi delivering a sermon during Friday prayers at a mosque in Mosul. Abu Bakr al-Baghdadi declared an Islamist caliphate in the territory under the group's control in Iraq and Syria In pictures: The rise of Isis Islamic extremists destroying mosques in Iraq Shiite's Al-Qubba Husseiniya mosque explodes in Mosul In pictures: The rise of Isis Islamic extremists destroying mosques in Iraq Smoke and debris go up in the air as Shiite's Al-Qubba Husseiniya mosque explodes in Mosul. Images posted online show that Islamic extremists have destroyed at least 10 ancient shrines and Shiite mosques in territory - the city of Mosul and the town of Tal Afar - they have seized in northern Iraq in recent weeks In pictures: The rise of Isis Islamic extremists destroying mosques in Iraq A bulldozer destroys Sunni's Ahmed al-Rifai shrine and tomb in Mahlabiya district outside of Tal Afar In pictures: The rise of Isis Iraq crisis Iraqi security forces celebrate after clashes with followers of Shiite cleric Mahmoud al-Sarkhi, in front of his home in the Shiite holy city of Karbala, 50 miles (80 kilometers) south of Baghdad In pictures: The rise of Isis Iraq crisis Iraqi security forces arrest a follower of Shiite cleric Mahmoud al-Sarkhi after clashes with his followers in the Shiite holy city of Karbala, 50 miles (80 kilometers) south of Baghdad In pictures: The rise of Isis Iraq crisis Iraqi security forces arrest a follower of Shiite cleric Mahmoud al-Sarkhi at his home after clashes with his followers in the Shiite holy city of Karbala, 50 miles (80 kilometers) south of Baghdad In pictures: The rise of Isis Iraq crisis Iraqi security forces arrest a follower of Shiite cleric Mahmoud al-Sarkhi after clashes with his followers in the Shiite holy city of Karbala, 50 miles (80 kilometers) south of Baghdad In pictures: The rise of Isis Iraq crisis A vehicle burns in front of a home of a follower of Shiite cleric Mahmoud al-Sarkhi after clashes with his followers in the Shiite holy city of Karbala, 50 miles (80 kilometers) south of Baghdad In pictures: The rise of Isis Iraqi refugees An Iraqi woman holds her exhausted son as over 1000 Iraqis who have fled fighting in and around the city of Mosul and Tal Afar wait at a Kurdish checkpoint in the hopes of entering a temporary displacement camp in Khazair In pictures: The rise of Isis Iraqi refugees Displaced Iraqi women hold pots as they queue to receive food during the first day of the Islamic holy month of Ramadan, at an encampment for displaced Iraqis who fled from Mosul and other towns, in the Khazer area outside Irbil, north Iraq In pictures: The rise of Isis Isis fighters in Syria A militant Islamist fighter waving a flag, cheers as he takes part in a military parade along the streets of Syria's northern Raqqa. The fighters held the parade to celebrate their declaration of an Islamic "caliphate" after the group captured territory in neighbouring Iraq In pictures: The rise of Isis Isis fighters in Syria Isis fighters wave flags as they take part in a military parade along the streets of Syria's northern Raqqa province Reuters In pictures: The rise of Isis Isis fighters in Syria Isis fighters travel in a vehicle as they take part in a military parade along the streets of Syria's northern Raqqa province In pictures: The rise of Isis Isis fighters in Syria Fighters from the Isis group during a parade with a missile in Raqqa, Syria. Militants from an al-Qaida splinter group held a military parade in their stronghold in northeastern Syria, displaying U.S.-made Humvees, heavy machine guns, and missiles captured from the Iraqi army for the first time since taking over large parts of the Iraq-Syria border In pictures: The rise of Isis Isis fighters in Syria Isis fighters during a parade in Raqqa, Syria In pictures: The rise of Isis Isis fighters in Syria Fighters from the Isis group during a parade in Raqqa, Syria. Militants from the splinter group held a military parade in their stronghold in northeastern Syria, displaying U.S.-made Humvees, heavy machine guns, and missiles captured from the Iraqi army for the first time since taking over large parts of the Iraq-Syria border In pictures: The rise of Isis Isis fighters in Syria Isis fighters hold a military parade in their stronghold in northeastern Syria In pictures: The rise of Isis Isis fighters in Syria Isis fighters during a parade in Raqqa, Syria In pictures: The rise of Isis Isis fighters in Syria A member loyal to the Isis waves an Isis flag in Raqqa In pictures: The rise of Isis Iraq crisis Iraqi anti-government gunmen from Sunni tribes in the western Anbar province march during a protest in Ramadi, west of Baghdad. The United Nations warned that Iraq is at a "crossroads" and appealed for restraint, as a bloody four-day wave of violence killed 195 people. The violence is the deadliest so far linked to demonstrations that broke out in Sunni areas of the Shiite-majority country more than four months ago, raising fears of a return to all-out sectarian conflict In pictures: The rise of Isis Iraq crisis Iraqi security forces hold up a flag of the Isis group they captured during an operation to regain control of Dallah Abbas north of Baqouba, the capital of Iraq's Diyala province, 35 miles (60 kilometers) northeast of Baghdad In pictures: The rise of Isis Isis fighters in Iraq Isis fighters parade in the northern city of Mosul In pictures: The rise of Isis Iraq crisis Volunteers, who have joined the Iraqi army to fight against the predominantly Sunni militants from the radical Isis group, demonstrate their skills during a graduation ceremony after completing their field training in Najaf In pictures: The rise of Isis Iraq crisis Kurdish Peshmerga troops fire a cannon during clashes with militants of the Isis group in Jalawla, Diyala province In pictures: The rise of Isis Lieutenant General Qassem Atta speaks during a press conference Iraqi Prime Minister's security spokesman, Lieutenant General Qassem Atta speaks during a press conference about the latest military development in Iraq, in the capital Baghdad. Iraqi forces pressed a campaign to retake militant-held Tikrit, clashing with jihadist-led Sunni militants nearby and pounding positions inside the city with air strikes in their biggest counter-offensive so far In pictures: The rise of Isis A police station building destroyed by Isis fighters An exterior view of a police station building destroyed by gunmen in Mosul city, northern Iraq. Iraq's new parliament is expected to convene to start the process of setting up a new government, despite deepening political rifts and an ongoing Islamist-led insurgency. Iraqi President Jalal Talabani issued a decree inviting the new House of Representatives to meet and form a new government In pictures: The rise of Isis Isis fighters in Iraq Smoke billows from an area controlled by the Isis between the Iraqi towns of Naojul and Tuz Khurmatu, both located north of the capital Baghdad, as Iraqi Kurdish Peshmerga forces take part in an operation to repel the Sunni militants In pictures: The rise of Isis Iraqi refugees An elderly Iraqi woman is helped into a temporary displacement camp for Iraqis caught-up in the fighting in and around the city of Mosul in Khazair In pictures: The rise of Isis Iraqi refugees An Iraqi Christian woman fleeing the violence in the village of Qaraqush, about 30 kms east of the northern province of Nineveh, cries upon her arrival at a community center in the Kurdish city of Arbil in Iraq's autonomous Kurdistan region In pictures: The rise of Isis Iraqi refugees An Iraqi woman, who fled with her family from the northern city of Mosul, prays with a copy of the Quran AP In pictures: The rise of Isis Isis fighters in Iraq The body of an Isis militant killed during clashes with Iraqi security forces on the outskirts of the city of Samarra Reuters In pictures: The rise of Isis Iraq crisis Iraqi civilians inspect the damage at a market after an air strike by the Iraqi army in central Mosul EPA In pictures: The rise of Isis Iraq crisis Members of the Al-Abbas brigades, who volunteered to protect the Shiite Muslim holy sites in Karbala against Sunni militants fighting the Baghdad government, parade in the streets of the city AP In pictures: The rise of Isis Iraq crisis Shia tribesmen gather in Baghdad to take up arms against Sunni insurgents marching on the capital. Thousands have volunteered to bolster defences AFP/Getty In pictures: The rise of Isis Iraq crisis A van carrying volunteers joining Iraqi security forces against Jihadist militants. Prime Minister Nuri al-Maliki announced the Iraqi government would arm and equip civilians who volunteered to fight AFP/Getty In pictures: The rise of Isis Iraq Fighters of the Isis group parade in a commandeered Iraqi security forces armored vehicle down a main road at the northern city of Mosul In pictures: The rise of Isis Iraq An Islamist fighter, identified as Abu Muthanna al-Yemeni from Britain (R), speaks in this still image taken undated video shot at an unknown location and uploaded to a social media website. Five Islamist fighters identified as Australian and British nationals have called on Muslims to join the wars in Syria and Iraq, in the new video released by the Isis In pictures: The rise of Isis Iraq Al-Qa’ida inspired militants stand with captured Iraqi Army Humvee at a checkpoint belonging to Iraqi Army outside Beiji refinery some 250 kilometers (155 miles) north of Baghdad. The fighting at Beiji comes as Iraq has asked the U.S. for airstrikes targeting the militants from the Isis group. While U.S. President Barack Obama has not fully ruled out the possibility of launching airstrikes, such action is not imminent in part because intelligence agencies have been unable to identify clear targets on the ground, officials said In pictures: The rise of Isis Iraq Militants attacked Iraq's main oil refinein Baiji as they pressed an offensive that has seen them capture swathes of territory, a manager and a refinery employee said In pictures: The rise of Isis Iraq Militants from the Isis group parading with their weapons in the northern city of Baiji in the in Salaheddin province In pictures: The rise of Isis Iraq A smoke rises after an attack by Isis militants on the country's largest oil refinery in Beiji, some 250 kilometers (155 miles) north of the capital, Baghdad. Iraqi security forces battled insurgents targeting the country's main oil refinery and said they regained partial control of a city near the Syrian border, trying to blunt an offensive by Sunni militants who diplomats fear may have also seized some 100 foreign workers In pictures: The rise of Isis Iraq Militants of the Isis group stand next to captured vehicles left behind by Iraqi security forces at an unknown location in the Salaheddin province. For militant groups, the fight over public perception can be even more important than actual combat, turning military losses into propaganda victories and battlefield successes into powerful tools to build support for the cause In pictures: The rise of Isis Iraq An injured fighter (C) from the Isis group after a battle with Iraqi soldiers at an undisclosed location near the border between Syria and Iraq In pictures: The rise of Isis Iraq Fighters from the Isis aiming at advancing Iraqi troops at an undisclosed location near the border between Syria and Iraq In pictures: The rise of Isis Iraq Fighters from the Isis group taking position at an undisclosed location near the border between Syria and Iraq In pictures: The rise of Isis Iraq Fighters from the Isis group inspecting vehicles of the Iraqi army after they were seized at an undisclosed location near the border between Syria and Iraq In pictures: The rise of Isis Iraq One Iraqi captive, a corporal, is reluctant to say the slogan, and has to be shouted at repeatedly before he obeys Sky News In pictures: The rise of Isis Iraq Iraqi captives held by the extremists Sky News In pictures: The rise of Isis Iraq Iraqi captives held by the extremists Sky News In pictures: The rise of Isis Iraq Militants of the Isis group force captured Iraqi security forces members to the transport In pictures: The rise of Isis Iraq Militants of the Isis group transporting dozens of captured Iraqi security forces members to an unknown location in the Salaheddin province ahead of executing them In pictures: The rise of Isis Iraq A major offensive spearheaded by Isis but also involving supporters of executed dictator Saddam Hussein has overrun all of one province and chunks of three others In pictures: The rise of Isis Iraq Militants of the Isis group executing dozens of captured Iraqi security forces members at an unknown location in the Salaheddin province In pictures: The rise of Isis Iraq Isis militants taking position at a Iraqi border post on the Syrian-Iraqi border between the Iraqi Nineveh province and the Syrian town of Al-Hasakah In pictures: The rise of Isis Iraq Isis rebels show their flag after seizing an army post AFP/Getty Images In pictures: The rise of Isis Iraq Isis militants waving an Islamist flag after the seizure of an Iraqi army checkpoint in Salahuddin Getty Images In pictures: The rise of Isis Iraq Demonstrators chant slogans as they carry al-Qa’ida flags in front of the provincial government headquarters in Mosul, 225 miles (360 kilometers) northwest of Baghdad. In the week since it captured Iraq's second-largest city, Mosul, a Muslim extremist group has tried to win over residents and has stopped short of widely enforcing its strict brand of Islamic law, residents say. Churches remain unharmed and street cleaners are back at work

The new government may be less divisive than the old one – it would be difficult to be more – but only to a limited degree. The most important security jobs of defence and interior minister have yet to be filled and there are many old faces in Mr Abadi’s cabinet. Senior members of the Marjaiyyah, the Shia clerical establishment, are reported to be disappointed that there are not more people chosen by merit rather than party allegiance.

Commenting on the euphoric response by the US Secretary of State John Kerry to the new line-up in Baghdad, an Iraqi observer said he doubted if Mr Kerry’s optimism would survive a meeting with Ibrahim al-Jaafari, notorious for his elusive style of conversation, who replaces Hoshyar Zebari, previously Iraq’s highly effective Foreign Minister.

Most importantly, the new government may not convince Iraq’s six million-strong Sunni community that they have any choice but to stick with Isis which has seized the Sunni provinces. Aside from minorities in these areas, such as the Shia, Yazidi, Turkoman, Kurds and Christians, the Sunni are more terrified of the return of vengeful Iraqi government forces than they are of Isis.

They have reason to be frightened since revenge killing of Sunni are taking place in Amerli, the Shia Turkoman town whose two-month siege by Isis was broken last month by Shia and Kurdish fighters aided by US air strikes. Mass graves of Shia truck drivers murdered by Isis are being excavated and local Sunni are being killed in retaliation. The family of a 21-year-old Sunni man abducted by militiamen was soon afterwards offered his headless body back in return for $2,000 (£1,240).

In the 127 villages retaken by the Kurds from Isis under the cover of US air strikes, the Sunni Arab population has mostly fled and is unlikely to return. Often Sunni houses are burnt by Shia militiamen and in one village Kurdish fighters had reportedly sprayed over the word “apostate” placed there by Isis and instead written “Kurdish home”.



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This atmosphere of terror means that the favoured US policy of getting the Baghdad government to give enough concessions to the Sunni to lure them away from support for Isis may not work. The US succeeded in 2006 and 2007 in turning many Sunni tribes and neighbourhoods against al-Qaeda in Iraq (AQI). But Isis is stronger and better organised than AQI and is wary of a stab in the back by fellow Sunni. To guard against this in Mosul it has taken some 300 hostages, including senior Sunni retired generals. In Deir Ezzor province in Syria, one tribe called the al-Sheitaat staged an uprising against Isis last month only to be swiftly defeated with 700 tribal members rounded up and executed.

Isis will be difficult to defeat in Iraq because of Sunni sectarian solidarity. But the reach of Isis in Iraq is limited by the fact that Sunni Arabs are only 20 per cent of the 33 million population. In Syria, by way of contrast, Sunni Arabs make up at least 60 per cent of Syrians, so Isis’s natural constituency is larger than in Iraq. Motorised Isis columns have been advancing fast here, taking some 35 per cent of the country and inflicting defeats both on other Syrian opposition fighters, notably Jabhat al-Nusra, the al-Qaeda affiliate, and on the Syrian army. Isis is now within 30 miles of Aleppo, the largest city in Syria before the war.

Barack Obama will not want to ally himself with President Assad in Syria (AP)

The US and its allies face a huge dilemma which is largely of their own making. Since 2011 Washington’s policy, closely followed by the UK, has been to replace President Bashar al-Assad, but among his opponents Isis is now dominant. Actions by the US and its regional Sunni allies led by Saudi Arabia, Qatar, Kuwait and Turkey, which were aimed at weakening Mr Assad, have in practice helped Isis. The 560-mile-long Turkish-Syrian border was left open by Ankara for jihadis to cross, enabling 12,000 foreign recruits to join the rebels, most becoming part of Isis. The US is now desperately trying to persuade Turkey to close the border effectively, but so far has only succeeded in raising the price charged by local guides taking people across the frontier from $10 to $25 a journey.

So far it looks as if Mr Obama will dodge the main problem facing his campaign against Isis. He will not want to carry out a U-turn in US policy by allying himself with President Assad, though the Damascus government is the main armed opposition to Isis in Syria. He will instead step up a pretence that there is a potent “moderate” armed opposition in Syria, capable of fighting both Isis and the Syrian government at once. Unfortunately, this force scarcely exists in any strength and the most important rebel movements opposed to Isis are themselves jihadis such as Jabhat al-Nusra, Ahrar al-Sham and the Islamic Front. Their violent sectarianism is not very different to that of Isis.

Lacking a moderate military opposition to support as an alternative to Isis and the Assad government, the US has moved to raise such a force under its own control. The Free Syrian Army (FSA), once lauded in Western capitals as the likely military victors over Mr Assad, largely collapsed at the end of 2013. The FSA military leader, General Abdul-Ilah al Bashir, who defected from the Syrian government side in 2012, said in an interview with the McClatchy news agency last week that the CIA had taken over direction of this new moderate force. He said that “the leadership of the FSA is American”, adding that since last December US supplies of equipment have bypassed the FSA leadership in Turkey and been sent directly to up to 14 commanders in northern Syria and 60 smaller groups in the south of the country. Gen Bashir said that all these FSA groups reported directly to the CIA. Other FSA commanders confirmed that the US is equipping them with training and weapons including TOW anti-tank missiles.

An injured boy is carried to a hospital after an airstrike in Damascus (Reuters)

It appears that, if the US does launch air strikes in Syria, they will be nominally in support of the FSA which is firmly under US control. The US is probably nervous of allowing weapons to be supplied to supposed moderates by Saudi Arabia and the Gulf monarchies which end up in the hands of Isis. The London-based small arms research organisation Conflict Armament Research said in a report this week that anti-tank rockets used by Isis in Syria were “identical to M79 rockets transferred by Saudi Arabia to forces operating under the Free Syrian Army umbrella in 2013”.

In Syria and in Iraq Mr Obama is finding that his policy of operating through local partners, whose real aims may differ markedly from his own, is full of perils.