The '''Molotov-Ribbentrop pact''' (formally the ''Treaty of Non-aggression between Germany and the Union of Soviet Socialist Republics'', also called the '''Hitler-Stalin pact''', '''Nazi-Soviet pact''' and '''Communazi pact''') was a treaty between [[Third Reich|Nazi Germany]] and the [[Soviet Union]], in the opening days of [[World War II]]. Some portions of the Molotov-Ribbentrop pact remained in force until the collapse of the Soviet Union in 1991.
Before the Soviet Union signed the pact, Japan and many European countries also signed nonaggression pacts with Nazi Germany. While Moscow had been negotiating this treaty with Berlin, the Soviets were fighting a major campaign against [[Hitler]]'s ally Japan. [[Stalin]] feared a two-front war against Germany and Japan. Representing the Soviets was foreign minister [[Vyacheslav Molotov]], and representing the Nazis was foreign minister [[Joachim von Ribbentrop]]. The treaty was signed on August 23, 1939, three days after the start of the Battle of [[Mongolia#Khalkhin Gol|Khalkhin-Gol]] between the Soviet Union and Japan. In mid-September, Tokyo signed a non-aggression pact with Moscow. After the Eastern border was secure Stalin then invaded Poland on 17 September 1939.<ref>Jerrold and Leona Schecter, ''Sacred Secrets: How Soviet Intelligence Operations Changed American History'', Washington, DC: Brassey’s, 2002, pg. 12.</ref>
The signing of the Communazi Peace Pact marked the end of the [[Popular Front]] era.