During the post World War One period, much of Eastern Europe became a mass of conflicting ideals and political groups and fighting. In most cases each country had its war of independence during the time. However the wider period is sometimes, inaccurately, called the Russian Civil War. Where White and Red Russians fought each other. The Whites and the nationalists were often supported by the west. Equally the differing groups were armed and equipped by the west.
During the next two years the Russian Baltic Fleet moved into Tallinn and set up a major fleet base there. Then came Operation Barbarossa. The Germans stormed across the Soviet captured territory and the Red Army threw everything into the fight. At Tallinn the Red Navy converted two of the captured Estonian Styer 640 trucks into armoured cars and issued them to the Russian Naval infantry.
(Apologies for both the short article and being late today. I'm currently moving house so the Internet connection, and my book collection are limited and patchy.)