US-Russia agree truce deal for Syria but doubts persist

The United States and Russia have announced plans for a partial truce in Syria but there were serious doubts it could take effect on Saturday as planned.

The agreement does not apply to jihadists like the Islamic State group and the Al-Nusra Front, putting up major hurdles to how it can be implemented on Syria's complex battlefield.

It calls for President Bashar al-Assad and opposition forces to agree by noon on Friday to comply with a "cessation of hostilities" that would then take effect at midnight.

Syrian volunteers take part in paramilitary training conducted by the Syrian army in al-Qtaifeh, north of Damascus on February 22, 2016 ©Louai Beshara (AFP)

The leading opposition group gave its conditional acceptance to the deal but there was no word yet from the regime, after the agreement was announced late on Monday.

Moscow and Washington have been leading the latest diplomatic push to try to resolve Syria's nearly five-year civil war, a brutal conflict that has left more than 260,000 dead and forced millions from their homes.

The two countries are on opposing sides of the conflict -- with Russia backing Assad and the United States supporting the opposition -- but in recent weeks have joined forces to press for the ceasefire.

"This is a moment of opportunity and we are hopeful that all the parties will capitalise on it," White House press secretary Josh Earnest said after US President Barack Obama and Russian counterpart Vladimir Putin discussed the deal by phone.

Putin said Moscow would do "whatever is necessary" to ensure Damascus respects the agreement.

"We are counting on the United States to do the same with its allies and the groups that it supports," he said.

UN Secretary General Ban Ki-moon called the deal a "long-awaited signal of hope" and urged all sides to abide by it.

- Truce deal 'likely doomed' -

Moscow and Washington are both pursuing air wars in Syria. A US-led coalition launched air strikes against IS positions in both Syria and Iraq in 2014 while Russia began its own aerial raids in Syria in September.

Russia says it is targeting "terrorists" in its strikes but has been accused of hitting non-jihadist groups in support of Assad, a longtime ally.

Iran has also sent military advisers to Syria and the Tehran-backed Lebanese Shiite movement Hezbollah has deployed at least 6,000 militants to fight alongside Assad's forces.

Analysts say that given the facts on the ground -- in particular the complicated make-up of Syria's opposition forces and frequently shifting frontlines -- the ceasefire may already be doomed to fail.

While IS control over territory is relatively clear and stable, its jihadist rival Al-Nusra Front, the local affiliate of Al-Qaeda, works closely with many other rebels groups.

"'Cessation of Hostilities' allows attacks on Nusra. That likely dooms it, since Russia/regime tend to hit others & call em Nusra (or IS)," Noah Bonsey, a senior analyst at the International Crisis Group, said on Twitter.

"To have any chance of addressing this, US/Russia must delineate Nusra areas BEFORE implementation."

The ceasefire plan was announced by top diplomats in Munich earlier this month, but failed to take hold last week as initially planned.

As well as reducing violence and expanding humanitarian access, it aims to pave the way for a resumption of peace talks that collapsed earlier this month in Geneva.

The talks had been scheduled to resume on February 25, but the UN Syria envoy has already acknowledged that date is no longer realistic.

The opposition High Negotiations Committee said its commitment to the truce was conditional on the lifting of sieges, the release of prisoners, a halt to bombardment of civilians and the delivery of humanitarian aid.

"We agreed to respond positively to international efforts to reach a truce deal" if the conditions are met, the Riyadh-based HNC said in a statement.

It quoted HNC head Riad Hijab as saying he did not have high expectations that the regime and its allies "would be able to commit to stopping their hostile acts".

- Elections set for April -

A convoy of 44 trucks carrying humanitarian aid overseen by the Red Crescent and the United Nations had entered Moadamiyet al-Sham, near Damascus, on Monday, state news agency SANA reported.

Once the cessation of hostilities takes hold, the UN would work to secure "access to as many places as possible in order to deliver humanitarian aid", UN spokesman Stephane Dujarric said.

The ceasefire announcement came just a day after IS claimed responsibility for two deadly attacks in regime-held areas, which a monitor said killed 134 people near a shrine south of Damascus and at least 64 in central Homs.

The shrine bombings marked the deadliest jihadist attack since Syria's conflict erupted in March 2011, said the Britain-based Syrian Observatory for Human Rights.

Shortly after the truce was announced, Assad issued a decree for parliamentary elections to be held on April 13, as the four-year term of the current legislature comes to a close.

The last such elections were held in May 2012 and although multiple parties were allowed to stand, most of the 250 lawmakers who were elected were from the ruling Baath party.

A Syrian army soldier takes aim from a position on the outskirts of Syria's Raqa region on February 19, 2016

Russian President Vladimir Putin delivers an address on the US and Russia's agreement to enforce ceasefire in Syria in his office near Moscow on February 22, 2016 ©Michael Klimentyev (SPUTNIK/AFP)

A wounded Syrian receives treatment at a hospital in the capital Damascus

Chiefs of staff of the countries which are part of the international US-led coalition against the Islamic State group, attend a meeting to discuss the situation in the region on February 22, 2016 in Kuwait City ©Yasser al-Zayyat (AFP)