In December, the talks reached a low point as Soviet officials continued to press demands for German military equipment and technology, including the delivery of German s , and . German officials noted that Soviet demand for some items by the end of 1940 would be impossible to meet, and would effectively have required three to four years of production. Molotov conceded the difficulties given Germany's ongoing war and the prospects for agreement improved. Tensions were also raised by the unsuccessful Soviet invasion of Finland, though the unexpected bloodbath that ensued left a Soviet general explaining at the time, "We have conquered just enough Finnish territory to allow us to bury our dead." At the same time, that winter, Germany had become concerned about the state and future of their economy.