Russian Ka-52 helicopters fly over Red Square during the Victory Day military parade in Moscow on May 9, 2018. (Kirill Kudryavtsev/AFP via Getty Images)Russian military planes fly over Dvortsovaya Square during the Victory Day parade in Saint Petersburg on May 9, 2018. (Olga Maltseva/AFP via Getty Images)Russian Sukhoi Su-34 bombers take to the skise as the country marks the 73rd anniversary of the Soviet Union's victory over Nazi Germany in World War Two. (Kirill Kudryavtsev/AFP via Getty Images)Russia's MiG-29 fighters of the Strizhi aerobatic team and Su-30 jet fighters of the Russkiye Vityazi aerobatic team fly over Red Square during the Victory Day military parade. (Kirill Kudryavtsev/AFP via Getty Images)Russia's Korsar UAV made an appearance at the parade. (Russian Presidential Press and Information Office)For many Russians, the annual Victory Day parade in Moscow is an opportunity to reflect on their wartime history and mourn losses that touched nearly every family in the former Soviet Union and neighboring states. (Russian Presidential Press and Information Office)Russian Tupolev Tu-95 turboprop-powered strategic bombers fly above the Kremlin during a rehearsal for the Victory Day military parade on May 4, 2018. (Yuri Kadobnov/AFP via Getty Images)