Ukrainian MPs were to vote on Monday on President Petro Poroshenko’s proposal following an emergency war cabinet on Sunday night. Poroshenko said the move was intended for defensive purposes and would not imply a declaration of war.

The UN security council was also holding an emergency meeting on Monday about the incident at the request of Ukraine.

Sunday’s hostilities began when Russia prevented three Ukrainian navy vessels from passing beneath its bridge in the Kerch strait by blocking the way with a cargo ship. Two artillery ships and a tug boat were subsequently fired on and seized. According to the FSB, Russia’s principal security agency, three Ukrainian sailors were wounded, but none of them were in a life-threatening condition.