YAVOROV, UKRAINE - SEPTEMBER 16:  Members of the U.S. Army 173rd Airborne Brigade demonstrate urban warfare techniques as Ukrainian soldiers look on on the second day of the 'Rapid Trident' bilateral military exercises between the United States and Ukraine that include troops from a variety of NATO and non-NATO countries on September 16, 2014 near Yavorov, Ukraine. The two-week exercises include participating units from a variety of NATO and NATO-associate countries as well as Ukrainian troops. Meanwhile the Ukrainian parliement today ratified an associate agreement with the European Union and also agreed on a autonomous status for the separatist-controlled portion of eatern Ukraine.  (Photo by Sean Gallup/Getty Images)