Rehearsal, Victory Day Military Parade, in Moscow. 排演, 勝利日閱兵

Russian military helicopters fly over Ivan the Great bell-tower and Moscow's Kremlin during a general rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 71 years after the victory in WWII in Moscow, Russia, on Thursday, May 5, 2016. (Photo by Ivan Sekretarev/AP Photo)

Russian servicemen march during a rehearsal for the Victory Day parade to mark the 71st anniversary of the victory over Nazi Germany in World War Two, in Red Square in Moscow, Russia, May 5, 2016. (Photo by Sergei Karpukhin/Reuters)

A Russian serviceman takes part in a rehearsal for the Victory Day parade to mark the 71st anniversary of the victory over Nazi Germany in World War Two in Red Square in Moscow, Russia, May 5, 2016. (Photo by Sergei Karpukhin/Reuters)

Russian servicemen take part in a rehearsal for the Victory Day parade to mark the 71st anniversary of the victory over Nazi Germany in World War Two in Red Square in Moscow, Russia, May 5, 2016. (Photo by Sergei Karpukhin/Reuters)

Rehearsal for the Victory Day Military Parade in Moscow
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