Moldavian Soviet Socialist Republic established

Soviet forces crossed into Finland after negotiations over border security and territorial concessions failed. The invasion was an act of aggression that produced heavy civilian and military losses...

The League condemned the Soviet invasion of Finland and expelled the USSR. The decision exposed the weakness of collective security and the limits of Soviet claims to defend peace through...

Soviet forces entered Estonia and Latvia after ultimatums and entered Lithuania under a similar demand. The occupation followed the 1939 mutual-assistance pacts; subsequent controlled political...

Following a Soviet ultimatum, Romania withdrew and Soviet troops entered Bessarabia and Northern Bukovina. The move expanded Soviet control and affected Romanian, Ukrainian, Jewish, Russian, and other...

Newly installed assemblies adopted resolutions seeking incorporation. These votes followed Soviet military occupation and political coercion; the Soviet and Baltic accounts of the process remain...

The USSR formally incorporated Lithuania after its occupation and a controlled political process. Soviet institutions and land, economic, and security policies were imposed amid resistance,...

The USSR formally incorporated Latvia following occupation and a staged political process. The change brought Soviet nationalization, political arrests, and institutional restructuring, while...

The USSR formally incorporated Estonia after occupation and controlled elections. The annexation ended Estonian independence and initiated Soviet restructuring, repression, and nationalization.

Germany launched Operation Barbarossa, opening a war of annihilation across Soviet territory. Occupation, mass shootings, starvation, forced labor, and the Holocaust devastated civilians; Soviet...

Vyacheslav Molotov’s broadcast informed Soviet listeners of the invasion and called for resistance. The statement framed the war as defense of the homeland and set out the state’s public response to a...