Russian servicemen operate Buk-M2 surface-to-air missile systems during a rehearsal for the Victory Day parade in Red Square in central Moscow

Russian servicemen operate Buk-M2 surface-to-air missile systems during a rehearsal for the Victory Day parade in Red Square in central Moscow

Russian servicemen operate Buk-M2 surface-to-air missile systems during a rehearsal for the Victory Day parade in Red Square in central Moscow, Russia, May 7, 2015. Russia will celebrate the 70th anniversary of the victory over Nazi Germany in World War Two on May 9. REUTERS/Grigory Dukor