Finland

Time Traveler
  Finnish postal history was chiefly impacted by its domineering neighbor Russia. Russia was wild about introducing a wave of "Russification" (i.e. converting everything into Russian) into its immediate neighbor nations. The first instance of Russification in Finland was when the independence of the Finnish postal system was absorbed by the Russian Interior Ministry. Over the next 10 years, the Russians imposed strict restrictions on the usage of Finnish postage on domestic mail and international mail in their aim to introduce the Russian postage system.

World War I came as a blessing in disguise to the Finns as it sparked off the notorious Russian Revolutions of 1917. This eventually led to the fall of Russian dominance in Finland, and the Finnish postal system regained independence.