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The Baltic States used to be among the poorest countries in Europe in 1930's.
And there was no an occupation. Since every occupation does ligally mean an armed conflict and a storm of a capital.
There was a lot of Lithuanins who supported the Soviets. I'd say 50/50. That's why there was no an armed conflict (compare it with the Soviet -Finnisg war). That was not an occupation if to speak legally. As well as the Latvian guards - with other Baltids - won the Bolshevik revolution.
On the other hand Russian Empire bought the Baltic States from Sweden. And all the Baltic States became "independent" when the Germans occupied them in WW1. Actually they used to be German puppets. So, their separation and independence from the Empire were illegal.
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