Lawmakers in Crimea, the autonomous republic of Ukraine, have voted to join Russia.
They also decided to hold a referendum in 10 days time on whether the Black Sea peninsula will become part of Russia or remain in Ukraine.
U.S. President Barack Obama said Thursday that the proposed upcoming referendum would violate Ukraine's Constitution and international law.
Meanwhile, Russia has accused the United States of double standards with regards to Moscow's assertions about the developments in Ukraine.
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