Donald Trump has announced fresh sanctions on Turkey and suspended negotiations on a $100bn (£79bn) trade deal, amid a mounting outcry over its assault upon Kurdish fighters as it invaded northern Syria.

The president signed executive orders to sanction the nation and will also boost tariffs on Turkish steel to 50 per cent.

In a statement Mr Trump vowed to "swiftly destroy" the Turkish economy if it continued down “this dangerous and destructive path”. He added that US troops coming out of Syria will redeploy and remain in the region to monitor the situation.

"The United States will aggressively use economic sanctions to target those who enable, facilitate, and finance these heinous acts in Syria," he added.

The US Treasury later said in a statement that action had been taken "against two [Turkish] ministries and three senior Turkish government officials in response to Turkey's military operations in Syria".

Turkey launches offensive into Syria Show all 25 1 /25 Turkey launches offensive into Syria Turkey launches offensive into Syria Turkish soldiers with armored vehicles EPA Turkey launches offensive into Syria A woman flees with her children during Turkish bombardment on Syria's northeastern town of Ras al-Ain AFP/Getty Turkey launches offensive into Syria Smoke billows following Turkish bombardment on Syria's northeastern town of Ras al-Ain in the Hasakeh province along the Turkish border on October 9, 2019. - Turkey launched an assault on Kurdish forces in northern Syria with air strikes and explosions reported along the border. President Recep Tayyip Erdogan announced the start of the attack on Twitter, labelling it "Operation Peace Spring". (Photo by Delil SOULEIMAN / AFP) (Photo by DELIL SOULEIMAN/AFP via Getty Images) DELIL SOULEIMAN AFP/Getty Turkey launches offensive into Syria The first group of Turkish infantry prepare to enter Syria on the border Getty Turkey launches offensive into Syria Civilians flee AFP/Getty Turkey launches offensive into Syria Smoke billows from targets inside Syria AP Turkey launches offensive into Syria Turkish armoured vehicles enter Syria in Akcakale Getty Turkey launches offensive into Syria Civilians leave as smoke rises from Ras al-Ain AFP Turkey launches offensive into Syria A multi-rocket launcher fires in an unknown location Turkish Defence Ministry via Reuters Turkey launches offensive into Syria People wave as Turkish soldiers prepare to cross the border Getty Turkey launches offensive into Syria Girls stand together in Ras al Ain town Reuters Turkey launches offensive into Syria A woman walks as smoke billows following Turkish bombardment in Syria's northeastern town of Ras al-Ain AFP/Getty Turkey launches offensive into Syria A Turkish army's tank drives down from a truck towards the border with Syria AFP/Getty Turkey launches offensive into Syria Turkish jet taxis on tarmac after returning to a military base in southeast Diyarbakir Reuters Turkey launches offensive into Syria A Turkish armored vehicle drives down a road during a military operation in Kurdish areas of northern Syria EPA Turkey launches offensive into Syria People sit on belongings at a back of a truck as they flee Ras al Ain town Reuters Turkey launches offensive into Syria Turkey-backed Syrian opposition fighters enter Tel Abyad AFP/Getty Turkey launches offensive into Syria Civilians flee AFP/Getty Turkey launches offensive into Syria People flee Tal Abyad North Press Agency/Reuters TV Turkey launches offensive into Syria People wave as Turkish soldiers prepare to cross the border into Syria Getty Turkey launches offensive into Syria Civilians flee with their belongings AFP/Getty Turkey launches offensive into Syria Civilians flee during Turkish bombardment on Syria's northeastern town of Ras al-Ain in the Hasakeh province along the Turkish border on October 9, 2019. - Turkey launched a broad assault on Kurdish-controlled areas in northeastern Syria today, with intensive bombardment paving the way for an invasion made possible by the withdrawal of US troops. (Photo by Delil SOULEIMAN / AFP) (Photo by DELIL SOULEIMAN/AFP via Getty Images) DELIL SOULEIMAN AFP/Getty Turkey launches offensive into Syria Turkish President Recep Tayyip Erdogan, right, speaks with Defense Minister Hulusi Akar, left, as they watch the operation by Turkish forces in Kurdish areas EPA Turkey launches offensive into Syria Smoke rises from the Syrian town of Tal Abyad AFP/Getty Turkey launches offensive into Syria Turkey-backed members of Syrian National Army prepare for moving to Turkey with heavy armed vehicles EPA

It added: "The Turkish government's actions are endangering innocent civilians, and destabilizing the region, including undermining the campaign to defeat Isis."

The White House also announced the president was sending Vice President Mike Pence to the Middle East, as tensions rose.

Mr Pence said Mr Trump spoke directly to Turkish leader Recep Tayyip Erdogan.

Mr Trump "communicated to him very clearly that the United States of American wants Turkey to stop the invasion, implement an immediate ceasefire and to begin to negotiate with Kurdish forces in Syria to bring an end to the violence,” Mr Pence said.

The US president appeared to backtrack on the green light he gave Ankara to launch its long-planned military operation into northeast Syria last week, after he pulled out a small number of US special forces who had been working with the Kurds, who soldiers had spearheaded the operation to destroy Isis.

Turkey began its offensive after the US pulled its military presence from northeast Syria, giving it the ability to attack the Kurdish fighters who had been a strong ally to American interests there.

Mr Trump has faced howls of opposition, notably from senior Republicans like Lindsey Graham, over his decision to withdraw from positions in northeast Syria.

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Kurdish fighters who helped push back Isis as part of the Syrian Democratic Forces (SDF) have looked for new allies to push back against aggression from Turkey.

"You have given up on us. You are leaving us to be slaughtered," SDF general Mazloum Kobani Abdi told William Roebuck, the deputy special envoy to the global coalition to defeat Isis, during a meeting on Thursday. That conversation was detailed in an internal US government readout obtained by CNN.