A Ukrainian soldier stand guard in front of armoured personnel carriers at a check point near the village of Malinivka, south-east of Slaviansk, in eastern Ukraine April 27, 2014. The de facto mayor of the Ukrainian city of Slaviansk said on Sunday mediators from the Organisation for Security and Cooperation in Europe who are seeking the release of a group of detained observers had arrived in the city. (Photo by Marko Djurica/Reuters)
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