MOSCOW (AP) — Russia on Friday celebrated the 80th anniversary of the defeat of Nazi Germany in World War II, as President Vladimir Putin presided over a massive parade of tanks, missiles and troops through Red Square and welcomed over two dozen world leaders — the most since Moscow sent troops into Ukraine.

Victory Day, celebrated on May 9, is Russia’s most important secular holiday, reflecting its wartime sacrifice. But it’s also used by the Kremlin to bolster patriotism and regain the superpower prestige it lost when the Soviet Union collapsed in 1991.