Ukrainian President Petro Poroshenko says that the enemy does not stop attempts to derail the Minsk peace process, making "irresponsible" statements on withdrawal from talks in the Normandy format.

"The enemy keeps on trying to thwart the Minsk process by making absolutely irresponsible statements about withdrawal from the negotiating 'Normandy format.' The intensity of attacks on our army positions in eastern Ukraine has drastically increased," Poroshenko said in the town of Brody in Lviv region on Thursday.