Vladimir Putin has said Russia is being threatened by German tanks “again” as it was during the second world war, warning that Moscow is ready to respond to aggression from the west. Speaking at events marking the 80th anniversary of the Red Army’s victory over Nazi Germany in Stalingrad, known today as Volgograd, Putin drew parallels between the Soviet Union’s fight in the second world war and Moscow’s intervention in Ukraine. “It’s unbelievable but true. We are again being threatened by German Leopard tanks,” he said in the southern city. “Again and again we are forced to repel the aggression...