Ukraine's acting president says its military is "on full combat alert" against a possible invasion by Russian troops massed on the border.
ພາບຫຼ້າສຸດ ຈາກ ຢູເຄຣນ
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Members of self-defense units of the Euromaidan movement (front) attack members and supporters of Ukrainian far-right radical groups (back) to prevent them from taking part in a torchlight procession, Kyiv, April 29, 2014.
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A pro-Russian activist waves a Donbas Republic flag over a crowd celebrating the capture of an administration building in the center of Luhansk, April 29, 2014.
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Pro-Russian masked and armed militants check the bus passengers' luggage, Slovyansk, Wednesday, April 30, 2014.
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Pro-Russian masked and armed militants guard barricades near Slovyansk, April 30, 2014.