A ceasefire is likely to collapse in east Ukraine and Russia could be drawn into a "big war" to cleanse the "sore on its borders", the former leader of the region's pro-Russian separatists said. Violence has eased but not halted in east Ukraine under what are known as the Minsk 2 agreements, reached in the Belarussian capital on Feb. 12 after an earlier ceasefire collapsed. Alexander Borodai, a Russian citizen and former journalist for nationalist newspapers who emerged last year as prime minister of the self-proclaimed Donetsk People's Republic (DNR), said he expects the Ukrainian army to launch a new offensive. "To be honest, I expect that the Minsk 2 agreements will not be observed, in the same manner as the Minsk 1 agreements were not," Borodai said. "And at the end of the day the Ukrainian army will launch an offensive. This is a very probable development ... I am not sure that it will end without a big war, as Russia cannot tolerate this sore on its borders forever." Borodai stepped aside in favor of a local man as the rebel leader last August but is widely believed to have strong political links in Moscow and an open channel to the Donbass region where the war has unfolded in the last 15 months. This is while, NATO also has increased its special forces in E. Europe this week, after Russia placed its new radar system in the Arctic.