Timeline of NATO expansion since 1949

FILE - Members of the 82nd Airborne Division of the U.S. Army clean weaponry ahead of deployment to Poland from Fort Bragg, N.C. on Monday, Feb. 14, 2022. 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/Nathan Posner, File)

Timeline of NATO expansion since 1949