The first contingent of U.S. troops has arrived in Poland for joint military drills. The paratroops from the U.S. Army's 173rd Airborne Brigade will be joined by another 450 over the coming days. In nearby Ukraine pro-Russian separatists holding the city of Slaviansk said they were bracing for an attack by Ukrainian forces. On Thursday there were signs of Ukrainian troops digging in to new positions a few kilometres away.
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