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MOSCOW — Ukraine’s parliament voted Monday to impose martial law in the country to fight what its president called “growing aggression” from Moscow after a weekend naval confrontation off the disputed Crimean Peninsula in which Russia fired on and seized three Ukrainian vessels amid renewed tensions between the neighbours.

Western leaders and diplomats urged both sides to de-escalate the conflict, and the U.S. blamed Russia for what it called “unlawful conduct” over Sunday’s incident in the Black Sea.

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Russia and Ukraine blamed each other in the dispute that further ratcheted up tensions ever since Moscow annexed Crimea in 2014 and threw its weight behind separatists in eastern Ukraine with clandestine support, including troops and weapons.

Ukrainian President Petro Poroshenko asked lawmakers in Kyiv to institute martial law, something the country has not done even during the worst of the fighting in the east that killed about 10,000 people.