Timeline of NATO expansion since 1949

FILE - A Romanian IAR99 fighter jet fires its canons during a joint NATO US-Romanian military exercise in Cincu, central Romania, Thursday, Sept. 25, 2014. 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)

Timeline of NATO expansion since 1949