ANKARA/BEIRUT — Turkey has killed at least 260 Syrian Kurdish fighters and Islamic State militants in its four-day-old offensive into the Kurdish-dominated Afrin region of northwest Syria, the Turkish military said on Tuesday. US President Donald Trump plans to raise concerns with Turkish President Tayyip Erdogan in a phone call expected on Wednesday about Ankara’s offensive against US-backed Kurdish YPG forces in Afrin, a senior US official said. French President Emmanuel Macron also voiced disquiet, a few hours after Turkey’s foreign minister said it wanted to avoid any clash with US, Russian or Syrian government forces during its offensive but would do whatever necessary for its security. The air and ground operation has opened a new front in Syria’s multi-sided civil war and could threaten US plans to stabilize and rebuild a large area of northeast Syria — beyond President Bashar al-Assad’s control — where Washington helped a force dominated by the YPG to drive out Islamic State militants. The United States and Russia both have military forces in Syria backing opposing sides and have called for restraint on the part of Ankara’s “Operation Olive Branch” to crush the YPG in the Afrin region near Turkey’s southern border. — Reuters