I honestly think that Putin's demise will have to come from within. I don't think that economic sanctions are proving to be a real threat to ordinary Russians yet. I agree that to stop purchasing oil from them will make a terrific difference. Also, I think that when the real truth reaches the population in Russia and not all the falsehoods that they are being fed by the state media, it will alter the attitude of many of them. We have to make life as difficult for the Russian people as possible.