World War II re-enactors dressed as Nazi Germany take part in a staged battle to mark the liberation city of Ostrava by Red Army from the Nazi invaders in 1945, Czech Republic, Thursday, April 30, 2015. (Photo by Sergei Grits/AP Photo)

World War II re-enactors dressed as Red Army soldiers take part in a staged battle to mark the liberation city of Ostrava by Red Army from the Nazi invaders in 1945, Czech Republic, Thursday, April 30, 2015. (Photo by Sergei Grits/AP Photo)

World War II re-enactors dressed as Red Army soldiers take part in a staged battle to mark the liberation of the city of Ostrava by Red Army from the Nazi invaders in 1945, Czech Republic, Thursday, April 30, 2015. (Photo by Sergei Grits/AP Photo)

Enthusiasts take part in an re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

A man dressed in a World War II Red Army uniform fires during a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

Enthusiasts take part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

Enthusiasts take part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

Enthusiasts take part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

Enthusiasts take part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

Enthusiasts take part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

Enthusiasts take part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

An enthusiast takes part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

Enthusiasts take part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

Enthusiasts take part in a re-enactment battle between the Soviet Red Army and German troops during the 70th anniversary of the liberation of Ostrava, in Ostrava, Czech Republic, April 30, 2015. (Photo by Laszlo Balogh/Reuters)

A World War II re-enactor dressed as Red Army soldiers rests after a staged battle to mark the liberation of the city of Ostrava by Red Army from the Nazi invaders in 1945, Czech Republic, Thursday, April 30, 2015. (Photo by Sergei Grits/AP Photo)

World War II re-enactors dressed as Red Army soldiers take part in a staged battle to mark the liberation of the city of Ostrava by Red Army from the Nazi invaders in 1945, Czech Republic, Thursday, April 30, 2015. (Photo by Sergei Grits/AP Photo)

World War II re-enactors dressed as Red Army soldiers take part in a staged battle to mark the liberation city of Ostrava by Red Army from the Nazi invaders in 1945, Czech Republic, Thursday, April 30, 2015. (Photo by Sergei Grits/AP Photo)

World War II re-enactors dressed as Red Army soldiers take part in a staged battle to mark the liberation city of Ostrava by Red Army from the Nazi invaders in 1945, Czech Republic, Thursday, April 30, 2015. (Photo by Sergei Grits/AP Photo)