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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An elderly couple dances as local citizens gather to observe May Day in Slovyansk, May 1, 2014.

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Participants hold a Soviet flag near a statue of Soviet leader Vladimir Lenin during an International Worker's Day, or Labor Day, parade in the town of Slovyansk, May 1, 2014.

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Participants shout slogans and wave Russian flags during an International Worker's Day parade in Donetsk, May 1, 2014.

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Local citizens march to observe May Day in the central square in Slovyansk, May 1, 2014.