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A soldier from Azerbaijan advances through smoke during training on the second day of the "Rapid Trident" NATO military exercises 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 parliament today ratified an associate agreement with the European Union and also agreed on a autonomous status for the separatist-controlled portion of eastern Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528252 )

Servicemen of US Army attend an opening ceremony of the "Rapid Trident" military exercises on September 15, 2014 near the western Ukrainian town of Yavoriv. US-led military exercises began in Ukraine on Monday after a day of deadly fighting between government forces and pro-Russian rebels in the restive east that has piled pressure on a shaky 10-day-old truce. AFP PHOTO/YURKO DYACHYSHYN/AFP/Getty Images ( 533431000 )

US servicemen check their equipment following the opening ceremony of the "Rapid Trident" military exercises on September 15, 2014 near the western Ukrainian town of Yavoriv. US-led military exercises began in Ukraine on Monday after a day of deadly fighting between government forces and pro-Russian rebels in the restive east that has piled pressure on a shaky 10-day-old truce. AFP PHOTO/YURKO DYACHYSHYN/AFP/Getty Images ( 533431078 )

Soldiers from Georgia participate in training on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528352 )

Members of the U.S. Army 173rd Airborne Brigade demonstrate urban warfare techniques as Bulgarian (bottom) and Ukrainian soldiers look on on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528042 )

Ukrainian marines practice urban warfare techniques following instruction from U.S. soldiers on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528080 )

Ukrainian soldiers attend the opening ceremony of the "Rapid Trident" NATO military exercises on September 15, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455473964 )

Ukrainian soldiers (L) and members of the U.S. Army 173rd Airborne Brigade arrive for the opening ceremony of the "Rapid Trident" NATO military exercises on September 15, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455473796 )

Members of the U.S. Army 173rd Airborne Brigade prepare weapons and equipment following the opening ceremony of the "Rapid Trident" NATO military exercises on September 15, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455473800 )

A member of the U.S. Army walks past soldiers of different nationalities prior to the opening ceremony of the "Rapid Trident" NATO military exercises on September 15, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455473842 )

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" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528004 )

Ukrainian soldiers attend the opening ceremony of the "Rapid Trident" NATO military exercises on September 15, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455473958 )

A Ukrainian soldier (R) and a member of the British Light Dragoons practice anti-IED (improvised explosive device) location and removal training on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528580 )

Members of the U.S. Army 173rd Airborne Brigade stand at attention as a Ukrainian folk dance group performs at the opening ceremony of the "Rapid Trident" NATO military exercises on September 15, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455474140 )

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" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455527954 )

Ukrainian marines practice urban warfare techniques following instruction from U.S. soldiers on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528096 )

Ukrainian marines practice urban warfare techniques following instruction from U.S. soldiers on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528112 )

A Ukrainian marine stands in a trench during training on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528270 )

Ukrainian soldiers take a break during training on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528316 )

A Ukrainian soldier (R) and a member of the British Light Dragoons practice anti-IED (improvised explosive device) location and removal training on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528612 )

Ukrainian marines train with a heavy mortar on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528634 )

Ukrainian marines train with a heavy mortar on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528650 )

Members of the British Light Dragoons receive instruction in anti-IED (improvised explosive device) location and removal from a Canadian soldier (L) on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528654 )

A Georgian soldier mans a machine gun during training on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528670 )

Ukrainian soldiers stand on an aromoured personnel carrier during reconnaissance training on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528678 )

Ukrainian marines receive instruction in urban warfare techniques from a U.S. military instructor (L) 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. (Photo by Sean Gallup/Getty Images) ( 455528742 )

Ukrainian marines listen to instruction in urban warfare techniques from a U.S. soldier (L) on the second day of the "Rapid Trident" NATO military exercises on September 16, 2014 near Yavorov, Ukraine. (Photo by Sean Gallup/Getty Images) ( 455528832 )

A dancer in Ukrainian national costume performs during the opening ceremony of the "Rapid Trident" military exercises on September 15, 2014 near the western Ukrainian town of Yavoriv. US-led military exercises began in Ukraine on Monday after a day of deadly fighting between government forces and pro-Russian rebels in the restive east that has piled pressure on a shaky 10-day-old truce. AFP PHOTO/YURKO DYACHYSHYN/AFP/Getty Images ( 533430923 )

A serviceman of US Army salutes the raising a Ukrainian flag during the opening ceremony of the "Rapid Trident" military exercises on September 15, 2014 near the western Ukrainian town of Yavoriv. US-led military exercises began in Ukraine on Monday after a day of deadly fighting between government forces and pro-Russian rebels in the restive east that has piled pressure on a shaky 10-day-old truce. AFP PHOTO/YURKO DYACHYSHYN/AFP/Getty Images ( 533430971 )

Servicemen of US Army attend an opening ceremony of the "Rapid Trident" military exercises on September 15, 2014 near the western Ukrainian town of Yavoriv. US-led military exercises began in Ukraine on Monday after a day of deadly fighting between government forces and pro-Russian rebels in the restive east that has piled pressure on a shaky 10-day-old truce. AFP PHOTO/YURKO DYACHYSHYN/AFP/Getty Images ( 533430993 )

Georgian servicemen rest during a break after an opening ceremony of the "Rapid Trident" military exercises on September 15, 2014 near the western Ukrainian town of Yavoriv. US-led military exercises began in Ukraine on Monday after a day of deadly fighting between government forces and pro-Russian rebels in the restive east that has piled pressure on a shaky 10-day-old truce. AFP PHOTO/YURKO DYACHYSHYN/AFP/Getty Images ( 533431028 )

Lithuanian servicemen walk following the opening ceremony of the "Rapid Trident" military exercises on September 15, 2014 near the western Ukrainian town of Yavoriv. US-led military exercises began in Ukraine on Monday after a day of deadly fighting between government forces and pro-Russian rebels in the restive east that has piled pressure on a shaky 10-day-old truce. AFP PHOTO/YURKO DYACHYSHYN/AFP/Getty Images ( 533431058 )

US servicemen check their equipment following the opening ceremony of the "Rapid Trident" military exercises on September 15, 2014 near the western Ukrainian town of Yavoriv. AFP PHOTO/YURKO DYACHYSHYN/AFP/Getty Images ( 533431044 )