Ukrainian tanks take up positions

Pro-Russian insurgents dug in across eastern Ukraine, fortifying their positions around seized buildings and erecting fresh barricades even as Ukrainian tanks took up positions outside one eastern city now controlled by armed men.

In Kiev, Ukraine’s acting president, Oleksandr Turchynov, announced an “anti-terrorist operation” to root out the separatists, but it was unclear how that measure differed from the one announced yesterday, which resulted in no visible action.