responding to the violation of the rules of engagement. i think this is in essence. >> what are you hearing, matthew, about this dispute with turkey? >> well, the russians are absolutely furious that this has taken place. not just because they've had one of their warplanes shot out of the sky by turkish f-16s but they lost one of the pilots. he was shot dead as the rebels filmed themselves machine gunning him as he parachuted to the ground. another marine, russian marine, was killed in the search and rescue operation that followed. so this has caused a massive political rupture here in russia. the russians are already talking about economic sanctions on turkey. the prime minister of russia, dmitry medvedev, has spoken to his prime minister, saying let's make a list of targets we can sanction, looking at gas supplies, food supplies.