Finland's Declaration of Independence was given on December 6, 1917 (this later became the Independence Day) and the Bolsheviks (Russia's ruling party; Finland was part of Russia) recognized Finland on December 31, 1917 (N.S.).
The recognitions of other major countries were all given by the end of 1919.
The date was 14th December 1955 according to the Member States-list.
Russia borders Finland.
Estonia
Russia borders the eastern border of Finland
Finland
Russia borders the eastern border of Finland
Never.
Russia
Finland
Russia to the East
Norway.
Estonia.