WASHINGTON (AP) — The State Department said Thursday that it has met directly with a Kurdish political party in Syria that is linked to a guerrilla group considered by the U.S. and Turkey as a terrorist organization.

The weekend meeting in Paris with the Kurdish Democratic Union Party, known as the PYD, is likely to further complicate relations between Washington and Ankara. The two countries are negotiating over how much Turkey is willing to contribute to a global coalition that aims to defeat the Islamic State militant group in Syria and Iraq.