demanded that all questions pending between the countries be resolved before an agreement could be made. Tensions had already built after Germany had ignored Stalin's letter regarding Axis membership, with negotiators almost coming to blows at one point. At the same time, German war planners were aware of the potential fragility of Soviet oil, agreeing with Allied military assessments that they had captured in France saying that "a few incendiary bombs would have sufficed to shut down Baku for years." At the same time, Britain was forecasting continued German oil problems. The British Chiefs of Staff produced a report in September 1940 predicting a possible exhaustion of German oil stocks by June 1941. They believed that Germany could only improve its position by defeating Britain or by driving the Royal Navy from the Eastern Mediterranean so that Germany could import Soviet and Romanian oil supplies by sea. An American spy then viewed a December German report detailing the need for an invasion of the Soviet Union because of projected mid-1941 shortages of heavy metals and other supplies. 1941 border and commercial agreement On January 10, 1941, Germany and the Soviet Union signed agreements in Moscow to settle all of the open disputes that the Soviets had demanded. The agreements extended trade regulation of the 1940 German-Soviet Commercial Agreement until August 1, 1942, and increased deliveries above the levels of year one of that agreement to 620 to 640 million Reichsmark. It also settled several border, trading rights, property compensation and immigration disputes. It further covered the migration to Germany within two and a half months of ethnic Germans and German citizens in Soviet-held Baltic territories, and the migration to the Soviet Union of Baltic and "White Russian" "nationals" in German-held territories. Secret protocols in the new agreement stated that Germany would renounce its claims to a strip of territory in Lithuania it had received in the "Secret Additional Protocols" of the German–Soviet Boundary and Friendship Treaty, in exchange for 7.5 million dollars (31.5 million Reichsmark). Because of currency fluctuation issues, the parties used American dollar demarcations for compensation totals. Because of a stronger German negotiation position, Karl Schnurre concluded that, in economic terms, the agreement was "the greatest Germany ever concluded, going well beyond the previous year's February agreement." The agreement included Soviet commitments to 2.5 million tons of grain shipments and 1 million tons of oil shipments, as well