Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Defense Secretary Nominee Slams Turkey's S-400 Deal as 'Wrong' Carla Babb President Donald Trump's nominee to be the next secretary of defense has slammed Turkey's acceptance of the Russian-made S-400 missile defense system, parts of which were delivered last week, as "wrong." "Their [Turkey's] decision on the S-400 is the wrong one, and it's disappointing," Secretary of the Army Mark Esper told members of the Senate Armed Services Committee during a hearing Tuesday on his nomination to lead the Defense Department. The decision by Ankara puts Russian advanced radar technology into a key NATO alliance member, which Washington and its allies fear could compromise NATO military systems in Turkey. The S-400 could potentially be used to target NATO jets, including NATO's newest stealth fighter jet, the U.S.-made F-35 Lightning II. .