Turkey

"De-escalate the situation before it becomes irreparable," Pentagon chief spokesman Jonathan Hoffman said.

The stop comes in response to threats from Turkey.

Turkey has begun an invasion of a Syrian region evacuated by U.S. troops.

The Pentagon came out in opposition to Turkey's plan to invade northeastern Syria.

Turkey was barred from the F-35 program after it decided to purchase the Russian S-400 missile.

The U.S.-backed SDF has begun pulling back and destroying fortifications in northern Syria.

Turkey has been banned from purchasing the F-35 after buying the Russian-made S-400 missile system.

The Trump administration has confirmed that NATO ally Turkey will be removed from the F-35 Joint Strike Fighter program.

Incirlik has played a key role in air operations against the Islamic State in Iraq and Syria.

The Pentagon says it will cost $500 million to $600 million to find new suppliers for F-35 parts produced by Turkey.