Mr. Putin, this is war.

Ukraine's president, Petro Poroshenko, has said that recent developments between his state and Russia imply that a war may begin.

According to the Ukrainian president, Russian stakes on the Ukrainian border are directly an expression of aggression, foreign media write, Periscopi notes.

Mr. Putin, this is war, it's aggression. It's not a joke. It's not an incident or a joke. It's war”, he said.

He has added further that no one can know exactly what Putin can do under his reasoning that he is protecting Russian interests. /Periscope.