US Vice President Mike Pence has announced that the US and Turkey have agreed to a five-day ceasefire in northern Syria.

The ceasefire will allow for a Kurdish withdrawal from a security zone roughly 20 miles south of the Turkish border.

After more than four hours of negotiations with Turkish President Recep Tayyip Erdogan, Pence said the purpose of his high-level mission was to end the bloodshed caused by Turkey’s invasion of Syria, and remained silent on whether the agreement amounted to another abandonment of the US’s former Kurdish allies in the fight against the so-called Islamic State.

Turkish troops and Turkish-backed Syrian fighters launched their offensive against Kurdish forces in northern Syria a week ago, two days after president Donald Trump suddenly announced he was withdrawing the US from the area.

Pence and US secretary of state Mike Pompeo lauded the deal as a significant achievement, and Trump tweeted that it was “a great day for civilisation”.

But the agreement essentially gives the Turks what they had sought to achieve with their military operation in the first place. After the Kurdish forces are cleared from the safe zone, Turkey has committed to a permanent ceasefire but is under no obligation to withdraw its troops.

In addition, the deal gives Turkey relief from sanctions the administration had imposed and threatened to impose since the invasion began, meaning there will be no penalty for the operation.

Kurdish forces were not party to the agreement, and it was not immediately clear whether they would comply. Before the talks, the Kurds indicated they would object to any agreement along the lines of what was announced by Pence.

But Pence maintained that the US had obtained “repeated assurances from them that they’ll be moving out”.

Ankara has long argued the Kurdish fighters are nothing more than an extension of the Kurdistan Workers Party, or PKK, which has waged a guerrilla campaign inside Turkey since the 1980s and which Turkey, as well as the US and European Union, designate as a terrorist organisation.