On 21 September, the Soviets and Germans signed a formal agreement to coordinate military movements in Poland, including the „cleansing“ of saboteurs.  In Lvov and Brest-Litovsk, joint German-Soviet parades were being held, and the country`s military commanders met in the city.  Stalin had decided in August to liquidate the Polish state, and a German-Soviet meeting in September dealt with the future structure of the „Polish region“.  The Soviet authorities immediately began a campaign of Sovietization of the newly acquired territories. The Soviets held orchestrated elections, the result of which was to become a legitimization of the Soviet annexation of eastern Poland.  In July, Soviet-German trade negotiations were opened.  In late July and early August, discussions between the parties revolved around a possible agreement, but Soviet negotiators made it clear that an economic agreement had to be drawn up first.  After Germany planned its invasion of Poland on 25 August and prepared for war with France, German war planners felt that a British maritime blockade would exacerbate the critical shortage of German raw materials, of which the Soviet Union was the only potential supplier.  From April to July, Soviet and German officials spoke on the possibility of starting political negotiations, but there were no real negotiations.  „The Soviet Union had wanted good relations with Germany for years and was pleased that this feeling was finally replicated,“ wrote historian Gerhard L. Weinberg.
 The ensuing discussion of a possible political agreement between Germany and the Soviet Union had to be insinuated in the context of economic negotiations between the two countries, as close military and diplomatic ties had been largely severely severed, as was the case before the mid-1930s.  In May, Stalin replaced his foreign minister from 1930 to 1939, Maxim Litvinov, who had spoken out in favour of rapprochement with the West and was Jewish with Vyacheslav Molotov to give the Soviet Union more leeway in discussions with more parties, rather than Britain and France.  On January 10, 1941, Germany and the Soviet Union signed an agreement that resolved several ongoing issues.  Secret protocols of the new agreement amended the „secret additional protocols“ of the German-Soviet Treaty on Borders and Friendship and sent the Lithuanian Band back to the Soviet Union in exchange for $7.5 million (31.5 million Marks).  The agreement officially established the border between Germany and the Soviet Union between the Igorka River and the Baltic Sea.  In addition, it extended the trade regime of the German-Soviet trade agreement from 1940 until 1 August 1942, increased deliveries beyond the level of the first year of the agreement, the trade rights populated in the Baltics and Bessarabia, calculated the compensation of German real estate interests in the Baltic states, now occupied by the Soviets, and covered other issues.  It also concerned the migration to Germany of ethnic Germans and German citizens in the Soviet Baltic regions within two and a half months, as well as the migration to the Soviet Union of Baltic and „Belarusian“ „nationals“ in the territories held by Germany.  Since the late 19th century, Germany, which has limited natural resources,  has been heavily dependent on imports of Russian raw materials.  Prior to the First World War, Germany imported 1.5 billion German brands of raw materials and other products from Russia each year.  This declined after the First World War, but after the trade agreements signed between the two countries in the mid-1920s, trade had increased until 1927 to reach 433 million German marks per year.
 In the late 1920s, Germany helped Soviet industry modernize and help build tank production facilities at the Bolshevik leningv plant and the Kharkov locomotive plant.