Russia has started military drills near the Ukrainian border in response to operations by Ukrainian forces against pro-Russian separatists and NATO exercises in eastern Europe.
Russian Defence Minister Sergei Shoigu told the Interfax news agency Moscow was "forced to react to such a development".
"If this military machine is not stopped, it will lead to greater numbers of dead and wounded," he said.
"Planned exercises by NATO forces in Poland and the Baltic countries do not foster normalisation of the situation surrounding Ukraine either,"
European Union foreign ministers added 13 people to their visa ban and asset freeze list over Ukraine's crisis.
Well that’s the voting over, and no surprises so far. A ‘Yes’ vote claimed to be 89% in Donetsk, and suddenly Ukraine is no more.
Nearly 90 percent of voters in eastern Ukrainian region voted for self-rule, the head of the separatist election commission said.