TOPSHOT - Pedestrians cross a street in front of a billboard displaying the symbol "Z" in the colours of the ribbon of Saint George and a slogan reading: "We don't give up on our people", in support of the Russian armed forces, in Saint Petersburg, on March 7, 2022. - On the 12th day of Russia's invasion of Ukraine on March 7, Russian forces pressed a siege of the key southern port of Mariupol and sought to increase pressure on the capital Kyiv. Kyiv remains under Ukrainian control as does Kharkiv in the east, with the overall Russian ground advance little changed over the last 24 hours in the face of fierce Ukrainian resistance. (Photo by AFP)