to do something to halt the fighting. matthew chance joins me live now from moscow. so matthew, the city's fall is a huge victory for the russian separatists, but also a clear violation of the cease-fire. at this point, what options do the international community have to keep russia and putin in check? >> well the options that the international community have are pretty limited and none are good. much will depend on the next step of the pro-russian separatists and their russian backers. the hope i suppose at the moment, is that the territory that includes this city that's already been capture willed be sufficient for the rebels and their sponsors in moscow. and the fear is it won't be enough this will be used as a springboard to take more territory. this is the concern. if that happens, well the options are, as they've already