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Polish Defence Minister Tomasz Siemoniak walks in front of the first American troops arrived in Poland to Swidwin on April 23, 2014, after Washington said it was sending a force of 600 to the Baltic states as the crisis over Ukraine deepens . (JANEK SKARZYNSKI/AFP/Getty Images) ( 529181312 )

Members of the U.S. Army 173rd Airborne Brigade attend a welcome ceremony upon their arrival by plane 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. (Photo by Sean Gallup/Getty Images) ( 486246993 )

Members of the U.S. Army 173rd Airborne Brigade unload equipment upon their arrival by plane 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. (Photo by Sean Gallup/Getty Images) ( 486247919 )

The shadows of Pro-Ukrainian supporters is seen as they stand holding a giant Ukrainian flag during a rally in the southern Ukrainian city of Mariupol on April 23, 2014. The first American troops arrived in Poland Wednesday, after Washington said it was sending a force of 600 to the Baltic states as the crisis over Ukraine deepens. Some 150 soldiers from the 173rd Airborne Brigade touched down early afternoon in Swidwin, in the northeast of the country, according to an AFP journalist at the scene. (ANATOLII STEPANOV/AFP/Getty Images) ( 529180439 )

Pro-Ukrainian supporters sing the national anthem during a rally in the southern Ukrainian city of Mariupol on April 23, 2014. The first American troops arrived in Poland Wednesday, after Washington said it was sending a force of 600 to the Baltic states as the crisis over Ukraine deepens. Some 150 soldiers from the 173rd Airborne Brigade touched down early afternoon in Swidwin, in the northeast of the country, according to an AFP journalist at the scene. (ANATOLII STEPANOV/AFP/Getty Images) ( 529180404 )

Polish General Adam Joks and Michael Foster Brigade Commander at 173rd Airborne Brigade smile as first American troops arrived at the airport in Swidwin, Poland on April 23, 2014, after Washington said it was sending a force of 600 to the Baltic states as the crisis over Ukraine deepens . (JANEK SKARZYNSKI/AFP/Getty Images) ( 529183684 )

Members of the U.S. Army 173rd Airborne Brigade march past a Polish paratrooper unit after a ceremony upon the U.S. troops' arrival by plane 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. (Photo by Sean Gallup/Getty Images) ( 486246703 )

U.S. Air Force planes ferrying men and equipment of the U.S. Army 173rd Airborne Brigade arrive 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. (Photo by Sean Gallup/Getty Images) ( 486248033 )

The first American troops arrive at the airport in Swidwin, Poland on April 23, 2014, after Washington said it was sending a force of 600 to the Baltic states as the crisis over Ukraine deepens. (JANEK SKARZYNSKI/AFP/Getty Images) ( 529181525 )