The U.S. has said it will not renew its deployment of Patriot air and missile defense units in Turkey, due to expire in October.

According to a joint statement issued on Sunday by the U.S. and Turkish governments, the units "will not be renewed beyond the end of the current rotation. Other relevant [NATO] Allies have also been consulted."

The missile batteries have been in Turkey as part of a NATO mission since 2013.

This decision "followed a U.S. review of global missile defense posture and the batteries will be redeployed to the United States for critical modernization upgrades.

"If needed, the United States is prepared to return Patriot assets and personnel to Turkey within one week," the statement added.