Why did Germany and the USSR agree to sign the pact in their accords?

Germany and the USSR signed the Molotov-Ribbentrop Pact in August 1939 primarily to secure their respective strategic interests. For Germany, the agreement provided a buffer against Soviet intervention while it invaded Poland, allowing Hitler to avoid a two-front war. For the USSR, the pact offered a chance to expand its territory and influence in Eastern Europe, as well as a temporary reprieve from the threat of German aggression. The non-aggression pact also included secret protocols dividing Eastern Europe into spheres of influence, which further facilitated their mutual interests.