Poroshenko urged Ukrainians to "keep gunpowder dry"

"We must keep the powder dry and be ready at any moment to repel the aggressor," Poroshenko wrote to Facebook about the video of the exercises of the Ukrainian Armed Forces fighters.

He noted that "the enemy must pay a high price."

Earlier, President of Ukraine Petro Poroshenko said that Russia allegedly intends to seize the Ukrainian Berdyansk and Mariupol.