Dr Tito Gronow, Finland Deputy Envoy gets candid on NATO joining. On April 4, 2023, Finland joined the North Atlantic Treaty Organization (NATO), becoming its 31st member. Undoubtedly, this is a significant event, given that NATO security guarantees will extend to this country which shares a 1,340 kilometre border with Russia. This historical moment in NATO’s history was full of symbolism, since NATO had clearly scored an additional point against Russia.