Ukrainian President Petro Poroshenko is upset over the fact that some coalition members have refused to vote for draft amendments to the Constitution and believes that their actions are an attack on the peace plan.

"I'm upset that an attack on the peace plan in Ukraine was carried out by some of our partners in the coalition," Poroshenko said during his speech at PJSC ArcelorMittal Kryvyi Rih on Friday.

He said that the situation had brought about a number of risks, in particular the halt of decentralization reform and the escalation of the conflict in eastern Ukraine.

"Ukraine could have been left to face the aggressor alone," Poroshenko said.