It’s the cutting up other peoples countries part without their say that the bully countries never understand.

There was also a secret protocol to the pact, which was revealed only after Germany’s defeat in 1945[101] although hints about its provisions had been leaked much earlier, so as to influence Lithuania.[102] According to the protocol, Poland, Romania, Lithuania, Latvia, Estonia, and Finland were divided into German and Soviet “spheres of influence”.[101] In the north, Finland, Estonia, and Latvia were assigned to the Soviet sphere.[101] Poland was to be partitioned in the event of its “political rearrangement”: the areas east of the Pisa, Narew, Vistula, and San rivers would go to the Soviet Union, and Germany would occupy the west.[101] Lithuania, which was adjacent to East Prussia, was assigned to the German sphere of influence, but a second secret protocol, agreed to in September 1939, reassigned Lithuania to the Soviet Union.[103] According to the protocol, Lithuania would be granted its historical capital, Vilnius, which was part of Poland during the interwar period. Another clause stipulated that Germany would not interfere with the Soviet Union’s actions towards Bessarabia, which was then part of Romania.[101] As a result, Bessarabia as well as the Northern Bukovina and Hertsa regions were occupied by the Soviets and integrated into the Soviet Union.

https://en.m.wikipedia.org/wiki/Molotov–Ribbentrop_Pact