Censor.NET reports that the interior minister, Arseniy Avakov, has told them that the T-72 tanks seen in the Snezhnoye area today entered Ukraine from Russia last night. Avakov reportedly said (translated by The Interpreter):

"Last night, three T-72 tanks crossed the Ukrainian state border from the Russian side. One tank is in the village of Snezhnoye. Two other tanks have moved out of the town. These tanks were intercepted by Ukrainian troops in the vicinity of Snezhnoye. A battle is under way."

But not everybody agrees that these are T-72s:

