The Soviet Union signed the Yalta Declaration on Liberated Europe of February 4 – 11 , 1945 , in which Stalin , Churchill , and Roosevelt jointly declare for the reestablishment of order in Europe according to the principle of the Atlantic Charter " the right of all peoples to choose the form of government under which they will live , the restoration of sovereign rights and self-government to those peoples who have been forcibly deprived of them by the aggressor nations . " The Yalta declaration further states that " to foster the conditions in which the liberated peoples may exercise these rights , the three governments will join ... among others to facilitate where necessary the holding of free elections . " Finally , the Soviet Union signed the Charter of the United Nations on October 24 , 1945 , which in Article I Part 2 states that one of the " purposes of the United Nations is to develop friendly relations among nations based on '' respect for the principle of equal rights and self-determination of peoples '' . " World War II losses in Latvia were among the highest in Europe . Estimates of population loss stand at 30 % for Latvia . War and occupation deaths have been estimated at 180,000 in Latvia . These include the Soviet deportations in 1941 , the German deportations , and Holocaust victims
Yalta Declaration on Liberated Europe
Yalta Conference
Soviet re-occupation of Latvia in 1944