US-Russia war of words on Ukraine

The first contingent of U.S. troops has arrived in Poland for joint military drills.<br/> <br />The paratroops from the U.S. Army's 173rd Airborne Brigade will be joined by another 450 over the coming days.<br/> <br />In nearby Ukraine pro-Russian separatists holding the city of Slaviansk said they were bracing for an attack by Ukrainian forces.<br/> <br />On Thursday there were signs of Ukrainian troops digging in to new positions a few kilometres away.<br/> <br />In a further twist Russia's Foreign Minister Sergei Lavrov said in a tv interview that the U.S. was behind events in Ukraine.<br/> <br />(SOUNDBITE)(English) RUSSIAN FOREIGN MINISTER SERGEI LAVROV SAYING:<br/> <br />"When you get daily phone calls from John Kerry telling you 'you must, you must, you must' and when you understand how many thousand kilometres the United States is away from Ukraine, and then you would see how agitated they are about seeing their sponsored people not really delivering on the things which are obvious, then you cannot avoid t