Washington issued a warning to Ankara on Friday after Turkish military forces ran a drill testing a Russian missile defense system, saying the strategic partnership with its NATO ally is at risk of being "seriously" affected.
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"The US Department of Defense condemns in the strongest terms Turkey's October 16 test of the S-400 air defense system, a test confirmed today" by President Recep Tayyip Erdogan, read a statement released by the office.
"Our position has always been clear and it has not changed: an operational S-400 system is not compatible with the commitments made by Turkey as an ally of the United States and NATO."
"We are opposed to Turkey testing this system, it could have serious consequences for our defense relations," the statement added.
