Trump’s promise to create a “safe zone” in Syria — long rejected by the Obama administration — also appears to have encouraged Erdogan to resurrect an idea that had lapsed since the defeat of the Syrian rebels in Aleppo late last year. Originally promoted by the Syrian opposition, with Turkish support, the concept envisaged enforcing a no-fly zone to prevent the Syrian government from carrying out airstrikes against civilians.
How this latest proposal would work wasn't clear, but Erdogan said the zone would be used to give sanctuary to Arab and Turkmen Syrians and would be "terrorist-free" — an apparent reference to the YPG Kurds as well as the Islamic State.
Erdogan said Turkey envisions participating in the Raqqa offensive as part of the U.S.-led coalition, but he also has made it clear on a number of occasions that he expects Trump to sever Washington’s connections to the YPG.
There has been no indication from Washington that the United States intends to abandon its alliance with the Kurds, who have emerged as the Pentagon's most effective military partner in Syria. The Kurds have been making steady progress with a three-month-old offensive to isolate and encircle Raqqa and are within a few miles of the city.
Meanwhile, Turkish troops and their Arab Syrian rebel allies have been bogged down for the past two months in a fierce battle to capture the Islamic State-held town of Al-Bab, more than 100 miles away. Turkey intervened in Syria in August to help Syrian rebels push the Islamic State out of areas bordering Turkey and also to drive a wedge between two expanding areas of Kurdish control.