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==What did the Molotov–Ribbentrop Pact do? ==

The two dictators signed secret protocols dividing central Europe between Stalin and Hitler. It effectively lets both the USSR and Germany invade freely countries listed within their “spheres of influence. However, Germany and the Soviet Union's agreement was not sustainable and ultimately set the stage for the Eastern Front of World War II. Still, the initial improving relations with Germany meant that the Soviet Union could expand its territory in Eastern Europe unmolested into the Baltic States. Stalin believed that his understanding with Hitler would last, and he became complacent.<ref> Montefiore, Simon Sebag. ''[https://www.amazon.com/gp/product/1400076781/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1400076781&linkCode=as2&tag=dailyh0c-20&linkId=eb9848bd0a98d402c5a3cab783e1108d Stalin: The Court of the Red Tsar]''. (London: Weidenfeld & Nicolson, 2003), p. 117</ref>