Let’s seee.... the CIA sneaked a missile battery (capable of tracking and hitting an aircraft at 33,000 ft.) into a hostile battlefield, did the deed, and then sneaked out without anybody noticing.
Okay.
Jack Bauer could have done it.
The Ukraine military uses the same BUK mobile missile system and has recently moved some BUK missile batteries into eastern Ukraine. How hard would it be for the CIA or one of its surrogates to gain access to one of these mobile systems?