Timeline of NATO expansion since 1949

FILE - Hungarian T-72 armoured tanks during a military drill in the Bakony Hill in Veszprem Country. Hungary, Poland, and the Czech Republic will become full members of the North Atlantic Treaty Organization (NATO) on March 12, 1999. 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/File)

Timeline of NATO expansion since 1949