warning of serious consequences. calling the action quote, a stab in the back by turkey. martha: national security correspondent jennifer griffin live at the pentagon. jennifer, do we know for sure the russian warplane violated the turkish air spies? reporter: radar validates turkish claims. u.s. pilots heard warnings issued by turkish f-16 pilots, on a guard frequency. u.s. aircraft hurt multiple warnings from the turks to the russian over the radio. turks say they issued 10 warnings in a matter of five minutes. military sources who i spoke to minutes after the plane went down, told me two turkish f-16s were involved. one fired, one aim-9 sidewinder. a heat-seeking missile a weapon normally fired at close range. what complicates the matters the plane wreckage is in syrian territory i'm told.