By Stine Jacobsen and Johan Ahlander STOCKHOLM/COPENHAGEN (Reuters) -A majority of Swedes are in favour of joining NATO, a poll showed on Friday, with Russia’s invasion of Ukraine spurring a rapid shift in attitudes in a country long known for neutrality. Sweden has not been in a war since 1814 and has built its foreign policy on “non-participation in military alliances.” It remained neutral throughout World War Two even as neighbouring Nordic countries were invaded, and during the Cold War. A poll by Demoskop and commissioned by Aftonbladet newspaper showed 51% of Swedes are now in favour of …