"We refer to the unprovoked act of aggression against Ukraine by Russia and its attempt to annex a part of the territory of a sovereign state," the resolution, backed by 250 lawmakers, read in part.
The resolution required 224 votes to pass, and came as Crimea prepares for a referendum Sunday on whether to secede from Ukraine and join Russia.
The Parliament declared that, under a principle of self-defense acknowledged in the U.N. Charter, a country can request help from other countries to restore its territorial integrity, the Russian news agency RIA Novosti said. It added Russia, a Security Council member, would likely veto a decision to help.
The Parliament also adopted a law forming a 60,000-strong National Guard under direction of the Interior Ministry, to "act in peacetime and in emergency situations" to defend Ukraine's security, Ukrainian Radio reported Thursday.