On Saturday at nearly 04:00 a.m. the officers of the State Border Guard Service of Ukraine near the checkpoint of Dibrovka of Donetsk region have registered a fact of illegal crossing of the Ukrainian border by five lorries and two motor cars that brought gunmen in from Russia.

Kyiv is sure that "this provocation happened under direct encouragement of the Russian border guards", the information policy department of Ukraine's Foreign Ministry reported.

"The entry to Ukraine of the armed terrorist groups organized by the Russian authorities is nothing other than one more act of aggression against our state, Russia's cynical neglect of the norms and principles of the international law. We're calling to the whole international society to immediately take all possible measures to stop the aggressor, not to let him to destroy a process of the democratic expression of will of the Ukrainian people," reads a statement from the ministry.