Finland Joined NATO

BRUSSELS, BELGIUM - APRIL 4: The Flag of Finland flies in front of the NATO Headquarters on April 4, 2023 in Brussels, Belgium. After three decades of military non-alignment, Finland officially became NATO's 31st member on Tuesday, a "historic day" for the Alliance that sparked Russia's anger. The Blue Cross flag (siniristilippu) dates from the beginning of the XX century, on a white background, it features a blue Nordic cross, which represents Christianity. (Photo by Thierry Monasse/Getty Images)