Which Russian city during war was under siege for more than 870 days?

The Siege of Leningrad, also known as the Leningrad Blockade was a prolonged military blockade undertaken mainly by the German Army Group North against Leningrad, historically and currently known as Saint Petersburg, in the Eastern Front theatre of World War II.

The siege started on September 8, 1941 when the last road to the city was severed. Although the Soviets managed to open a narrow land corridor to the city on January 18, 1943, the siege was lifted on January 27, 1944. This occurred 872 days after it began.

The Siege of Leningrad was one of the longest and most destructive sieges in history and possibly the costliest in terms of human casualties.