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Members of a Polish paratrooper unit watch as a U.S. Air Force plane ferrying men and equipment of the U.S. Army 173rd Airborne Brigade lands at a Polish air force base on April 23, 2014 in Swidwin, Poland. Approximately 150 U.S. troops, as well as another 450 destined for the three Baltic states in coming days, will participate in bilateral military exercises over the coming weeks in a sign of commitment among NATO members. Tensions are rising in eastern Ukraine between Russian separatists and Ukrainian authorities and NATO is seeking to reassure its own members located close to Russia.

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