Есть например такой Geoffrey Roberts - он примерно везде пишет
На русском есть СФЕРЫ ВЛИЯНИЯ И СОВЕТСКАЯ ВНЕШНЯЯ ПОЛИТИКА В 1939-1945 гг.: ИДЕОЛОГИЯ, РАСЧЕТ И ИМПРОВИЗАЦИЯ
Готовность Москвы закончить войну на этих условиях объяснялась различными политическими и стратегическими расчетами - например, военной ценой завоевательной кампании и опасностью англо-французской интервенции в помощь финнам.
STALIN’S WARS FROM WORLD WAR TO COLD WAR, 1939–1953
The greatest danger to Stalin came when Britain and France began assembling an expeditionary force to Finland with the aim of using the ‘Winter War’ as an excuse to occupy the iron ore fields of northern Sweden. In those circumstances the Germans would have intervened to protect raw materials vital to their war economy and the Soviet Union would have been dragged into the greater European war. The Finns were also fearful of an escalation of the war and sued for peace. Under the terms of the peace treaty signed in March 1940 Finland conceded the Soviet territorial demands but retained its independence as a state.