Russia threatens WORLD WAR 3 if Finland, Sweden try joining NATO.
Among the Nordic countries, Norway is a NATO member, but Sweden and Finland - both geographically closer to Russia - are not.
On 17 September 1809, the period of Swedish rule over the rest of Finland came to an end when the Treaty of Hamina was signed, ending the Finnish War. As a result, the eastern third of Sweden was ceded to the Russian Empire and became established as the autonomous Grand Duchy of Finland.
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