Russian Air Force aerobatic teams “Strizhi” (Swifts) on MiG-29 and “Russian Knights” on Su-27 fly over 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 Mi-35 military helicopters are seen flying in formation through a glass roof of GUM department store 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 Grigory Dukor/Reuters)





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 Sukhoi Su-34 military jets are seen flying in formation through a glass roof of GUM department store 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 Grigory Dukor/Reuters)





A Russian serviceman drives a Russian self-propelled howitzer Koalitsiya-SV at a range before a rehearsal for the Victory Day parade, with the Moscow International Business Center also known as “Moskva-City” seen in the background, in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





A Russian serviceman walks past Russian Iskander-M missile launchers before a rehearsal for the Victory Day parade, with the Moscow International Business Center also known as “Moskva-City” seen in the background, at a range in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





A Russian T-14 tank with the Armata universal combat platform is parked at a range before a rehearsal for the Victory Day parade, with the Moscow International Business Center also known as “Moskva-City” seen in the background, in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





Russian military vehicle columns are seen at a range before a rehearsal for the Victory Day parade, with the Moscow International Business Center also known as “Moskva-City” seen in the background, in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





A Russian military vehicle column is seen before a rehearsal for the Victory Day parade, with the Moscow International Business Center also known as “Moskva-City” seen in the background, at a range in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





Russian servicemen sit atop of Russian T-90A main battle tanks before a rehearsal for the Victory Day parade, with the Moscow International Business Center also known as “Moskva-City” seen in the background, at a range in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





Russian servicemen stand next to a Russian Yars RS-24 intercontinental ballistic missile system before a rehearsal for the Victory Day parade, with the Moscow International Business Center also known as “Moskva-City” seen in the background, at a range in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





Russian servicemen sit atop of Russian BMP-3 armoured personnel carriers before a rehearsal for the Victory Day parade, with the Moscow International Business Center also known as “Moskva-City” seen in the background, at a range in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





People take pictures of Russian T-14 tank with the Armata universal combat platform as it leaves a range to take part in a rehearsal for the Victory Day parade in Moscow, Russia, May 5, 2016. (Photo by Maxim Shemetov/Reuters)





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 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)





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)





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)





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)





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)





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)





Tourists take pictures while Russian military helicopters fly over the St. Basil's Cathedral, center, and the Spasskaya Tower, right, in Red Square during a rehearsals ahead of the upcoming Victory Day Parade in Moscow, Russia, Thursday, May 5, 2016. Russians will celebrate Victory in WWII on May 9. (Photo by Alexander Zemlianichenko/AP Photo)