sentences:  Several secret articles were attached to the treaty.These articles allowed for the exchange of Soviet and German nationals between the two occupied zones of Poland, redrew parts of the central European spheres of interest dictated by the Molotov–Ribbentrop Pact, and also stated that neither party to the treaty would allow on its territory any "Polish agitation" directed at the other party.During the western invasion of Poland, the German "Wehrmacht" had taken control of the Lublin Voivodeship and eastern Warsaw Voivodeship - territories which according to the Molotov–Ribbentrop Pact were in the Soviet sphere of influence.