behavior, russian aggression against ukraine. >> well, i think it's certainly true that the very stringent sanctions that have been imposed against russia by the united states, its allies in the european union and others as well may have had an impact on the russian economy but don't seem to have done much to change russian policy, which was the stated intention of them. in that extense sense, many experts look at this carefully and say they've not been a success. that doesn't mean there aren't going to be more sanctions that could have an impact, of course. it's exactly this kind of escalation this kind of tension as it bubbles into actual violence that may provoke a much stronger reaction. what's taken place the last 24 hours or so, ukrainian navy say at least six of its sailors were injured when russia opened fire on three of its vessels in the kerch strait, very narrow stretch of water that exists between the russian mainland and