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Russia's aerobatic team "Swifts" fly over during a celebration of the 75th anniversary of the Battle of Stalingrad in Volgograd, Russia, on Feb. 2, 2018. Russian President Vladimir Putin Friday took part in the celebration of the 75th anniversary of the Battle of Stalingrad against Nazi Germany in World War II (WWII). (Xinhua/Bai Xueqi)
