Timeline of NATO expansion since 1949

FILE - NATO leaders and delegates take part in a session with invitees, at the NATO Summit conference in Bucharest, Thursday April 3, 2008. Finland and Sweden are nearing decisions on whether to ditch their long-standing policy of military nonalignment and join NATO in the wake of Russia's invasion of Ukraine. Finnish President Sauli Niinisto is expected to announce his stance on NATO membership on Thursday, May 12, 2022. (AP Photo/Vadim Ghirda, File)