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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A pro-Russian armed man waves to participants of an International Worker's Day parade in the town of Slovyansk, May 1, 2014.

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Ukrainian government troops guard a checkpoint near the village of Dolina, 30 kilometers from Slovyansk, May 1, 2014.

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Ukraine's acting president Oleksandr Turchynov chairs a meeting at the presidential administration stating that Ukraine's police and security forces are "helpless" to quell unrest in two eastern regions bordering Russia, Kyiv, April 30, 2014.

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Pro-Russian activists gather at a barricade outside the regional government headquarters in Luhansk, April 30, 2014.