Turkey

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.

Turkey's purchase of the so-called "F-35 killer" has begun despite retaliatory plans to boot it from the jet program.

Turkish Aerospace Industries on Monday unveiled its own next-generation fighter concept.

The U.S. Defense Department has given Turkey one last chance to cancel its planned order of the Russian-made S-400.

Turkey's commitment to acquiring Russia's S-400 anti-air system is unacceptable, Air Force Lt. Gen. Tod Wolters said.

The U.S. has halted shipments after the NATO ally refused to back down from its intent to purchase the Russian-made S-400.