Visitors attend a graduation ceremony at the National University of Defence of Ukraine in Kiev, April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian army officers attend a graduation ceremony at the National University of Defence of Ukraine in Kiev, April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian Air Force officers attend a graduation ceremony at the National University of Defence of Ukraine in Kiev, April 24, 2015. (Photo by Gleb Garanich/Reuters)

A visitor and Ukrainian army officers arrive to a graduation ceremony at the National University of Defence of Ukraine in Kiev, April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian army officers attend a graduation ceremony at the National University of Defence of Ukraine in Kiev, April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian Navy officer (C) and army officers attend a graduation ceremony at the National University of Defence of Ukraine in Kiev, April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian Air Force (C) officer attends a graduation ceremony at the National University of Defence of Ukraine in Kiev, April 24, 2015. (Photo by Gleb Garanich/Reuters)

A boy plays with a toy after a graduation ceremony at the National University of Defence of Ukraine in Kiev, Ukraine April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian Air Force officers take part a graduation ceremony at the National University of Defence of Ukraine in Kiev April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian Air Force (R) and army officers attend a graduation ceremony at the National University of Defence of Ukraine in Kiev April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian army officers throw coins after a graduation ceremony at the National University of Defence of Ukraine in Kiev April 24, 2015. (Photo by Gleb Garanich/Reuters)

A Ukrainian army officer poses for a picture with his family after a graduation ceremony at the National University of Defence of Ukraine in Kiev, Ukraine April 24, 2015. (Photo by Gleb Garanich/Reuters)

A boy, wearing his father's military cap, poses for a picture after a graduation ceremony at the National University of Defence of Ukraine in Kiev, Ukraine April 24, 2015. (Photo by Gleb Garanich/Reuters)

A Ukrainian army officer kisses his wife after a graduation ceremony at the National University of Defence of Ukraine in Kiev, Ukraine April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian army officers and their relatives drink champagne after a graduation ceremony at the National University of Defence of Ukraine in Kiev, Ukraine April 24, 2015. (Photo by Gleb Garanich/Reuters)

A girl alines as she attends a graduation ceremony at the National University of Defence of Ukraine in Kiev, April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian army officers pose for a picture after a graduation ceremony at the National University of Defence of Ukraine in Kiev, Ukraine April 24, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian Air Force (R) and army officers attend a graduation ceremony at the National University of Defence of Ukraine in Kiev, Ukraine April 24, 2015. (Photo by Gleb Garanich/Reuters)

A Ukrainian army officer plays with his son after a graduation ceremony at the National University of Defence of Ukraine in Kiev, Ukraine April 24, 2015. (Photo by Gleb Garanich/Reuters)