Turkey's purchase of Russia’s S-400 missile defense system creates "unacceptable risks" for the U.S., a Department of Defense official said Thursday.
"The radar system would provide Russia with military sensitive info on the F-35, which is our top-quality fifth-generation aircraft," Andrew Winternitz, acting deputy assistant secretary of defense for European and NATO policy, said at a panel hosted by Foreign Policy magazine.
"From our perspective, there are no measures that can mitigate our concerns on this," he added.