Ok, the CIA tasked a foreign military aircraft to kill US citizens. Simple solution. Charge the agents and their supervisors with murder, same with the folks that approved the mission. Ordinarily I'd say bomb the folks responsible for shooting down the aircraft, but as they were acting on official or unofficial orders from the CIA, I can't blame them too much.
Heck, I'm tempted to say bomb them anyways to send two messages. Don't listen to folks from the CIA and don't clip Americans unless they really deserve it. If we did so, then the next time a US agency says "Hey, can you kill some Americans for us?", the answer will be "Are you [bleep] insane, you retarded [bleep]! [bleep], No and [bleep] you! Last time we did that, we got hit with napalm and white phosphorous for a week."