The US national security spokesperson, John Kirby, has called on the Russian president, Vladimir Putin, to stay out of the upcoming US election after Putin expressed his preference for incumbent Joe Biden over leading Republican nominee Donald Trump. Kirby told reporters at a press conference on Thursday: "I think Mr Putin knows very well what this administration has been doing to counter Russia"s malign influence around the world and certainly what they"ve been doing inside Ukraine" Putin says he prefers Biden to Trump and mocks Tucker Carlson’s questions "More predictable": Vladimir Putin says he prefers Joe Biden to Donald Trump – video