During the same period , millions of former Russian citizens were forcefully repatriated against their will into the USSR . On 11 February 1945 , at the conclusion of the Yalta Conference , the United States and United Kingdom signed a Repatriation Agreement with the USSR . The interpretation of this Agreement resulted in the forcible repatriation of all Soviets regardless of their wishes . When the war ended in May 1945 , British and United States civilian authorities ordered their military forces in Europe to deport to the Soviet Union millions of former residents of the USSR , including many persons who had left Russia and established different citizenship decades before . The forced repatriation operations took place from 1945 to 1947
Yalta Conference
Yalta Conference
Refugee