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Western nations have called on Russia to ease tensions in Ukraine's Crimea region after armed men seized the local parliament and raised the Russian flag.
Russia also scrambled fighter jets along its borders as part of military exercises it announced a day earlier.
Moscow said it was willing to work with the West on averting a crisis, but warned foreign powers against taking decisions on behalf of Ukrainians.
Meanwhile, the ousted Ukrainian president is reported to be in Russia.
Viktor Yanukovych plans to hold a news conference in the southern Russian city of Rostov-on-Don on Friday, Russia's Ria news agency reports.
Earlier, in his first statement since being voted out of office by MPs last week, Mr Yanukovych said he had been "compelled to ask the Russian Federation to ensure my personal security from the actions of extremists" and that he still considered himself the legitimate president of Ukraine.
Also on Thursday, Ukraine's new interim government - including Prime Minister Arseniy Yatsenyuk - was approved by parliament.
Read more on this story [BBC]