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The Soviet Union invades Finland, initiating the so-called Winter War. The Finns sue for an armistice and have to cede the northern shores of Lake Lagoda and the small Finnish coastline on the Arctic Sea to the Soviet Union.
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Germany invades Denmark and Norway. Denmark surrenders on the day of the attack; Norway holds out until June 9.
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Italy enters the war. Italy invades southern France on June 21.
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Germany attacks western Europe—France and the neutral Low Countries. Luxembourg is occupied on May 10; the Netherlands surrenders on May 14; and Belgium surrenders on May 28. On June 22, France signs an armistice agreement by which the Germans occupy the northern half of the country and the entire Atlantic coastline. In southern France, a collaborationist regime with its capital in Vichy is established.
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The Soviet Union forces Romania to cede the eastern province of Bessarabia and the northern half of Bukovina to the Soviet Ukraine.