SIMFEROPOL, Ukraine — Crimea’s parliament on Monday declared the region an independent state, after its residents voted overwhelmingly to break off from Ukraine and seek to join Russia.

In the same resolution, it said that all Ukrainian state property on the territory of the Black Sea peninsula will be nationalized and become the property of the Crimean Republic.

Sunday’s referendum is not recognized by the West, and the United States and the European Union are preparing sanctions against Russia, whose troops have been occupying Crimea for several weeks.

Crimean lawmakers have asked the United Nations and other nations to recognize it.

A delegation of Crimean lawmakers is set to travel to Moscow Monday for negotiations on how to proceed further. Russian lawmakers have suggested that formally annexing Crimea is just a matter of time.

On Sunday, fireworks exploded and Russian flags fluttered above jubilant crowds after the secession vote. The United States and Europe condemned the ballot as illegal and destabilizing.

Ukraine’s new government in Kiev called the referendum a “circus” directed at gunpoint by Moscow – referring to the thousands of Russian troops now in the strategic Black Sea peninsula after seizing it two weeks ago.

But after the polls closed late Sunday, crowds of ethnic Russians in the regional Crimean capital of Simferopol erupted with jubilant chants in the main square, overjoyed at the prospect of once again becoming part of Russia.

The Crimea referendum offered voters the choice of seeking annexation with Russia or remaining in Ukraine with greater autonomy. After 50 percent of the ballots were counted, Mikhail Malishev, head of the referendum committee, said more than 95 percent of voters had approved joining Russia.

Opponents of secession appeared to have stayed away Sunday, denouncing the vote as a cynical power play and land grab by Russia.

The vote could also encourage rising pro-Russian sentiment in Ukraine’s east and lead to further divisions in this nation of 46 million. Residents in western Ukraine and the capital, Kiev, strongly favor closer ties with the West instead of Russia.