The State Department told about the US position on the purchase of S-400 by Turkey

“Our policy regarding the S-400 has not changed,” TASS quotes him.

According to him, Russian S-400s are incompatible with NATO equipment.

Price also stated that the S-400s "threaten the security of NATO technologies and do not meet Turkey's obligations" as a member of the alliance.

Earlier, the United States announced that they would not form a working group with Turkey to resolve the situation with Ankara's acquisition of Russian S-400 systems.