Relations between Finland and Russia have been conducted over many centuries, from wars between Sweden and Russia in the early 18th century, to the planned and realized creation and annexation of the Grand Duchy of Finland during Napoleonic times in the early 19th century, to the dissolution of the personal union between Russia and Finland after the forced abdication of Russia's last czar in 1917, and subsequent birth of modern Finland. Finland had its own civil war with involvement by Soviet Russia, was later invaded by the USSR, and had its internal politics influenced by it. Relations since then have been both warm and cool, fluctuating with time.

The Note Crisis was a political crisis in Soviet–Finnish relations in 1961. The Soviet Union sent Finland a diplomatic note on October 30, 1961, referring to the threat of war and West German militarization and proposing that Finland and the Soviet Union begin consultations on securing the defence of both countries, as provided for in the Finno-Soviet Treaty of 1948. The note coincided with the detonation of the Tsar Bomba, the most powerful nuclear test in history, and followed close on the heels of the Berlin Crisis and Bay of Pigs Invasion.