Syrian government forces will deploy along the Turkish border to help repel the Turkish military incursion against Syrian Kurds, Kurdish officials announced Sunday.

Turkish President Recep Tayyip Erdogan says threats of sanctions and arms embargoes by Western powers will not halt his country’s cross-border military offensive against Kurdish militants in Syria’s northeast.

The U.S. is withdrawing all remaining troops from northern Syria, as President Donald Trump said Sunday it was “very smart… for a change” to not be involved in the fighting sparked by Turkey’s onslaught against the U.S.’s long-time battlefield ally, Kurdish fighters.