"The most important strategic resource during the Cold War was oil. The first half of the twentieth century had seen its rise from a minor source of energy to becoming the substance that made modern states work. Armies depended on it for transport, and civilian economies depended on it for production. The Soviet Union became self-sufficient in 1954, so it was not competing with the West for access to foreign oil for its own sake. But the post-Stalin Moscow leaders knew how dependent US allies were on oil imports for their economic development. In western Europe dependence on oil for energy consumption increased from less than 10 percent in 1945 to over a third in 1960. In Japan the figures were even more striking: from 6 percent to 40. Eight-five percent of western Europe’s imports came from the Middle East already by 1950. For the United States, which up to 1970 relied primarily on its own production for domestic use, controlling access to Middle Eastern oil was therefore still of major strategic importance."