A top #Pentagon general has called counterparts in #Russia and #Ukraine, as the US Defense department expresses concern over a reported buildup of Russian troops along the Ukrainian border.
Ukraine's smouldering seven-year war with Russian-backed separatists on its eastern border has flared up sharply in recent days, following the worst clashes in months. 
4 Ukrainian soldiers were killed after an hours-long battle last Friday, north of the separatist stronghold city of Donetsk.
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