Ukraine: Russian officer fired missile that downed MH17

The Ukraine makes a new and direct allegation.

A senior Ukrainian official tells CNN it was a Russian officer who triggered the surface-to-air missile that blew Malaysia Airlines Flight 17 out of the sky.

A Russian, who hit, go. Not just advised, not just trained, not just supplied the missile system, but a Russian who hit, fire.

Kyung Lah is OutFront in Ukraine with more.