What was one of Stalin's fears when Hitler came to power?

Stalin's primary fear when Hitler came to power was indeed centered around the idea that Hitler aimed to expand into Russian territories. This assessment was rooted in Hitler's own writings and speeches, particularly in "Mein Kampf," where he articulated a vision for German expansion, which included the Lebensraum concept. Lebensraum, or "living space," suggested that Germany needed to acquire more territory to support its growing population and resources, leading many to interpret this as a direct threat towards the Soviet Union.

Given the historical context of the time, Hitler’s aggressive foreign policies raised alarms in Moscow. The treaty of Brest-Litovsk and prior conflicts had already created a backdrop of tension between Germany and the newly established Soviet state. As a leader, Stalin was acutely aware of the potential dangers posed by a militarized and expansionist Germany, especially after witnessing the rapid rearmament and assertive actions taken by the Nazis.

In contrast, the other options do not accurately reflect Stalin's primary concerns regarding Hitler’s rise. The restoration of the monarchy in Germany was not a significant worry, as the Nazi Party itself rejected traditional monarchist values. There was also no major concern that Hitler would seek to spread Communism; rather, they were ideological enemies. Similarly, alliances