A senior security official in Moscow has accused Finland of laying the ground for an attack on Russia by Nato, in comments that echo President Putin’s justifications for the invasion of Ukraine. Dmitry Medvedev, the former president and prime minister who is now the deputy head of Russia’s national security council, issued his warning after a visit to Russia’s 830-mile border with Finland. “After joining Nato, under the guise of defence measures, Helsinki is pursuing a confrontational course in preparation for war with Russia, apparently preparing a springboard for an attack on us,” Medvedev wrote in an article that was...