The correct answer is: Germany signs the Nazi-Soviet Nonagression Pact or Hitler-Stalin with Russia promising to never attack each other.
In spite of their dramatically opposed ideologies, Germany and the Soviet Union signed a non-aggression pact. This treaty in which the two countries agreed to take no military action against each other for the next 10 years, surprised the world. Europe was on the brink of another major war, and Joseph Stalin viewed the pact as a way to keep the Soviet Union on peaceful terms with Germany, while giving him time to build up the military army. Adolf Hitler used the pact to invade Poland unopposed. However, the German-Soviet Nonaggression Pact fell apart in 1941, when Nazi forces invaded the Soviet Union.