ISTANBUL — Turkish President Recep Tayyip Erdogan said on Monday he received a “positive response” from US President Donald Trump when he informed him that he will launch a new military offensive against a US-backed Kurdish militia if it remains in parts of northeast Syria despite a warning from the Pentagon that such an incursion would jeopardize the fight against the Islamic State.

It was the second assurance that top Turkish officials attributed to Trump in as many days as they seek concessions from the United States over a raft of disputes ranging from the conflict in Syria to the extradition of Turkish coup suspects and a standoff with Saudi Arabia over the murder of journalist Jamal Khashoggi.

Turkey is outraged by US support for the People’s Protection Units (YPG), labeling it a terrorist organization because of its links to the Kurdistan Workers Party (PKK), which has waged a three-decade armed campaign for autonomy inside Turkey. Ankara accuses Washington of foot-dragging on an agreement to move the Kurdish fighters east of the Euphrates River and is now threatening to go after them there, too. Turkish warplanes have also bombed Kurdish positions in northern Iraq in recent days.

“I spoke with Mr. Trump. These terrorists need to go to the east of the Euphrates. If they don’t, we will force them out, because they are disturbing us. … Since the US is our strategic ally, they need to do what is necessary,” Erdogan told a crowd of supporters in a televised speech.