Russian Tu-95MS strategic bombers fly in formation during rehearsals for the Victory Day military parade, with St. Basil's Cathedral seen in the foreground, in central Moscow May 5, 2015. Russia will celebrate the 70th anniversary of the victory over Nazi Germany in World War Two on May 9. (Photo by Tatyana Makeyeva/Reuters)

Russian Su-30SM and Su-35S fighter aircrafts fly in formation during rehearsals for the Victory Day military parade, with St. Basil's Cathedral seen in the foreground, in central Moscow May 5, 2015. (Photo by Tatyana Makeyeva/Reuters)

Russian Su-24 jet fighters fly in formation during rehearsals for the Victory Day military parade, with St. Basil's Cathedral seen in the foreground, in central Moscow May 5, 2015. (Photo by Tatyana Makeyeva/Reuters)

Russian jet fighters fly above the Kremlin, during the rehearsal for a military parade at the Red Square in Moscow, Russia, May 5, 2015. The Victory Day parade on May 9, 2015 marks the 70th anniversary since the capitulation of Nazi Germany. (Photo by Yuri Kochetkov/EPA)

Russian troops march through the Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years of the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Pavel Golovkin/AP Photo)

Russian servicemen march in formation before a rehearsal for the Victory parade on Moscow's Red Square May 4, 2015. Russia will celebrate the 70th anniversary of the victory over Nazi Germany in World War Two on May 9. (Photo by Sergei Karpukhin/Reuters)

Russian servicemen march during a rehearsal for the Victory parade on Moscow's Red Square May 4, 2015. (Photo by Maxim Shemetov/Reuters)

Russian servicemen take part in a rehearsal for the Victory parade on Moscow's Red Square May 4, 2015. (Photo by Maxim Shemetov/Reuters)

Russian servicemen operate “Armata” main battle tank during a rehearsal for the Victory parade on Moscow's Red Square May 4, 2015. (Photo by Sergei Karpukhin/Reuters)

Russian servicemen march during a rehearsal for the Victory parade on Moscow's Red Square May 4, 2015. (Photo by Maxim Shemetov/Reuters)

Russian self-propelled guns “Koalitsiya-SV” are seen during a rehearsal for the Victory parade on Moscow's Red Square May 4, 2015. (Photo by Sergei Karpukhin/Reuters)

Russian servicemen march during a rehearsal for the Victory parade, with the Kremlin's Spasskaya (Saviour) Tower seen in the background, on Moscow's Red Square May 4, 2015. (Photo by Sergei Karpukhin/Reuters)

A traffic police car leads Russian military vehicles making their way throughout the empty main street to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

New Russian military vehicles make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. The military parade takes place on Saturday, the 70th anniversary of the victory over Nazi Germany in World War II. (Photo by Alexander Zemlianichenko/AP Photo)

New Russian military vehicles including the new Russian T-14 Armata tank, center foreground, make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

The New Russian T-14 Armata tanks make their way to Red Square with the Historical Museum in the background, during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

New Russian military vehicles including the new Russian T-14 Armata tank, foreground, make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

Russian military vehicles including the new Russian T-14 Armata tank, center, make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

World War II era Soviet tanks T-34, front, and other military vehicles make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

New Russian military vehicles make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. The military parade takes place on Saturday, the 70th anniversary of the victory over Nazi Germany in World War II. (AP Photo/Alexander Zemlianichenko)

Russian military vehicles make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

The New Russian T-14 Armata tanks prepare to make their way to Red Square with the Historical Museum, in the background, during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

New Russian military vehicles make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

New Russian T-14 Armata tanks make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

The new Russian T-14 Armata tank makes its way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

New Russian T-14 Armata tanks, foreground, make their way to Red Square during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 to celebrate 70 years after the victory in WWII, in Moscow, Russia, Monday, May 4, 2015. (Photo by Alexander Zemlianichenko/AP Photo)

Russian army helicopters fly over Moscow during a rehearsal for the Victory Day military parade which will take place at Moscow's Red Square on May 9 in Moscow, Russia, Tuesday, May 5, 2015. (Photo by Pavel Golovkin/AP Photo)