What is the origin of Victory Day?

The Soviet Union (Russia) designated May 9 as the Victory Day of the Great Patriotic War.

1941On June 22nd, German fascists suddenly launched a war against the Soviet Union in an attempt to conquer the Soviet Union within three months. The people of the Soviet Union launched a great patriotic war against fascist Germany. 1On May 9, 945, Germany signed an unconditional surrender to the Soviet Union, Britain and the United States.

Since then, May 9th every year has been regarded as the Victory Day of the Great Patriotic War of Russia, which crushed fascist Germany, and it has been stipulated that May 9th will be a national holiday, on which a grand military parade will be held.