Watch: Putin Makes Surprise Visit To Russian-Occupied Mariupol After Crimea

Russian President Vladimir Putin on Sunday visited Mariupol, in the occupied Donetsk region, which has been one of the most heavily contested and bombarded cities in Ukraine during the war. The president considers the territory to be part of Russia and annexed the region, as well as other areas in eastern Ukraine, in September last year. Putin also visited occupied Crimea on Saturday, which was illegally annexed by Russia in 2014 which he attempted to legitimize with a referendum that is unrecognized by Ukraine and the U.S.