Russia Puts S-400 Systems on Experimental Combat Duty in Country's Northwest

MOSCOW (Sputnik) – Russia has put S-400 Triumf air defense systems on experimental combat duty in the country’s northwest, the Western Military District spokesman said Thursday.

"Today, several S-400 long-range S-400 Triumf air defense systems were put on experimental combat duty to protect the state borders in northwestern Russia," Col. Igor Muginov told reporters.