After the establishment of diplomatic relations in 1918, Armas Saastamoinen was appointed envoy to Denmark and played an important role in fostering relations between the two countries.[2] He assumed his role in October 1918, after having been Chargé d'affaires since April same year.[3]
In October 1926, Finnish President Relander visited Denmark and visited King Christian X, who would visit Finland in May 1928. During the Winter War, over a thousand Danes volunteered to fight on the Finnish side, even though only some pilots reached the frontline before the end of the war. Around 200 Danish volunteers took part in the Continuation War. Around 4,000 Finnish war children were sent to Denmark during the war, of which 350 remained in the country after the war. After the war, when Finland joined the Nordic Council in 1955, contact between the two countries intensified.[2]