Timeline of NATO expansion since 1949

FILE - Paratroopers take part in an exercise of the U.S. Army Global Response Force in Hohenfels, Germany, Wednesday, Aug. 26, 2015. 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/Matthias Schrader, File)

Timeline of NATO expansion since 1949