Ukraine's acting president says its military is "on full combat alert" against a possible invasion by Russian troops massed on the border.
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.
A woman hands a pro-Russian armed man a can of coffee outside the regional government headquarters in Luhansk, April 30, 2014.
Pro-Russian activists gather at a barricade outside the regional government headquarters in Luhansk, April 30, 2014.
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.