By Simon Johnson and Johan Ahlander STOCKHOLM (Reuters) – Swedish membership of NATO would boost national security and help stabilise the Nordic and Baltic regions, Foreign Minister Ann Linde said on Friday, a day after neighbour Finland said it would seek to join the U.S.-led alliance without delay. Russia’s invasion of Ukraine has forced Sweden – and its closest military partner Finland – to publicly pick sides after remaining outside the military alliance since it was founded in 1949 to counter the Soviet Union in the Cold War. Stockholm is widely expected to follow Helsinki’s lead and coul…