assistant from the russian personnel. >> it's strange to think it could be used by separatists without at least some measure of russian support. >> reporter: the missile that shot down the jet say u.s. officials came from this missile system, a russian made buk or sa-11. today, new audio recordings obtained by cnn from ukrainian officials describe how they received the same missile launcher from russia. [ speaking foreign language ]. and after the malaysian jet was shot down, ukrainian intelligence points to this video which shows a vehicle carrying the launcher back into russian territory, minus one missile on top. today, sergey lavrov said he