St. Andrew’s Flag Day is observed in Russia every December 11, commemorating the adoption of the Saint Andrew’s flag as the naval ensign of the Imperial Russian Navy. The flag features a white background with two blue diagonal bands forming an X-shaped cross, known as Saint Andrew’s Cross. This symbol is significant in Christian tradition, as it represents the crucifixion of Andrew the Apostle, who is considered the patron saint of Russia. The celebration dates back to 1699 when Emperor Peter the Great approved the flag's design, and it was officially adopted in 1712. After the Russian Revolution, the flag was replaced by the communist red flag but was reintroduced as the ensign of the Russian navy in 1992 following the collapse of the USSR. The day is marked by naval ceremonies and events honoring the historical significance of the flag and its connection to Russia's maritime heritage.