KIEV (REUTERS) - Ukrainian International, Ukraine's biggest airline, said on Friday the airspace over the Crimea region had been closed after its main airport was taken over by armed men.

Interfax reported earlier on Friday that no flights from the national capital Kiev were being allowed to Simferopol international airport. But an airport information official said only one flight from Kiev had been delayed, and other flights had been coming and going from Simferopol without any problems.

Meanwhile, Ukraine has embarked on moves to seek Yanukovych extradition from Russia after the ousted president appeared in southern Russia, the prosecutor general's office said.

Mr Yanukovych is wanted in Ukraine for mass murder following the deaths of about 100 people in clashes with police and security forces during three months of protests.