The Pentagon chastised Trkiye for "uncoordinated" actions during its military operation in Syria

The US military has said recent Turkish airstrikes in Syria "threatened the safety" of American soldiers still occupying part of the country, and claimed that further escalations could compromise efforts to defeat the remnants of the Islamic State (IS, formerly ISIS) terrorist group.

In a statement issued on Wednesday, the Pentagon said it is "deeply concerned" about rising hostilities in Syria, Iraq and Trkiye, noting that Ankara's strikes on Kurdish militia factions earlier this week risked harming US forces stationed in close proximity.

"Recent air strikes in Syria directly threatened the safety of US personnel who are working in Syria with local partners to defeat ISIS and maintain custody of more than ten thousand ISIS detainees," said Pentagon press secretary Patrick Ryder, adding that "This escalation threatens the Global Coalition to Defeat ISIS's years-long progress."

Just one day earlier, the White House voiced support for Trkiye's ongoing 'Claw-Sword' operation in Syria, with National Security Council spokesman John Kirby saying Ankara faces a "legitimate terrorist threat" from some Kurdish groups and has "every right" to defend itself. However, the endorsement was somewhat reluctant, as Kirby suggested the mission could "force a reaction" from US-backed Kurdish fighters, which might "constrain their ability to continue the fight against ISIS."

Though the Pentagon continued to recognize Ankara's "legitimate security concerns" on Wednesday, it also warned of "uncoordinated military actions" in Iraq - which, like Syria, shares a border with Trkiye - saying they undermine Baghdad's sovereignty. It urged for "immediate de-escalation" in the region to "ensure the safety and security of personnel on the ground."

According to the Defense Department, just shy of 1,000 American soldiers remain in Syria, many embedded alongside the Kurdish-dominated Syrian Democratic Forces (SDF). The militia has long served as Washington's main partner on the ground in Syria, despite repeated objections from Damascus, which has demanded an end to the unauthorized US troop presence. 

Since the air operation was launched over the weekend, Ankara carried out a series of air and artillery strikes against targets linked to the Kurdistan Workers Party (PKK) and the YPG, which it considers to be terrorist organizations. Trkiye claims to have eliminated as many as 254 militants and hit 471 "terrorist" targets in Syria and Iraq.

Hostilities between Trkiye, a NATO member, and armed Kurdish groups have endured for decades, with periodic bouts of violence erupting since the 1970s. Ankara blamed Kurdish factions for the November 13 bomb attack in Istanbul, which claimed the lives of six people and wounded 81 more. 

President Recep Tayyip Erdogan warned on Wednesday that the air raids were "just the beginning" and the country may soon launch a ground offensive into Kurdish-controlled areas. Erdogan also reassured the Iraqi and Syrian governments that Ankara's operation is not a challenge to their sovereignty or territorial integrity, and stressed that the aim of the operation is to protect the security of Trkiye.