"We object to Turkey"s testing of this system, which risks serious consequences for our security relationship," Hoffman said WASHINGTON: The Pentagon on Friday strongly condemned the test of a Russian-made S-400 missile defense system by NATO ally Turkey and warned of "serious consequences." "The US Department of Defense condemns in the strongest possible terms Turkey"s October 16 test of the S-400 air defense system," Pentagon spokesman Jonathan Hoffman said in a statement. "We object to Turkey"s testing of this system, which risks serious consequences for our security relationship," Hoffman said. "We have been clear and unwavering in our position: an operational S-400 system is not consistent with Turkey"s commitments as a US and NATO Ally."