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The Secret Protocol
The secret protocol held an agreement between the Nazis and Soviets that greatly affected Eastern Europe. For the Soviets for agreeing to not join the possible future war, Germany was giving the Soviets the Baltic States (Estonia, Latvia, and Lithuania). Poland was also to be divided between the two - along the Narew, Vistula, and San rivers.
The new territories gave the Soviet Union the buffer (in land) that it wanted to feel safe from an invasion from the West. It would need that buffer in 1941
Impacts of the Pact
When the Nazis attacked Poland in the morning on September 1, 1939, the Soviets stood by and watched. Two days later, the British declared war on Germany and World War II had begun. On September 17, the Soviets rolled into eastern Poland to occupy their "sphere of influence" designated in the secret protocol.
Because of the Nazi-Soviet Non-Aggression Pact, the Soviets did not join the fight against Germany, thus Germany was successful it its attempt to safeguard itself from a two-front war.
The Nazis and the Soviets kept the terms of the pact and the protocol until Germany's surprise attack and invasion of the Soviet Union on June 22, 1941
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Lithuania , Latvia, Estonia lost its independene and Poland,Czech,Hungary,Romania,BUlgaria were under Soviet occupation for next 50 years
I`m not sure if people from these countries can say that end of war was a Victory for them