noun
Yalta Agreement
Historical term referring to the secret 1945 agreement at the Yalta Conference where the Soviet Union agreed to enter the war against Japan.
See also: ヤルタ会談
ヤルタ秘密協定は、ソ連の対日参戦の条件を定めた。
The Yalta Agreement set the conditions for the Soviet Union's entry into the war against Japan.
ヤルタ会談 refers to the Yalta Conference itself, while ヤルタ秘密協定 specifically denotes the secret agreement made there.
Compound of ヤルタ (Yalta, the location of the conference) and 秘密協定 (secret agreement).