During the Cold War era, the petroleum and gas industries in the Soviet Union gained attention as major strategic industries for the nation. They became essential in the resumption and advancement of international trade between the Soviet Union and the West. Within the Soviet Union’s domestic economic development strategy, the development of the petroleum and gas industries was imperative. These sectors started to be actively developed after World War II and entered a phase of massive capital investment during the Khrushchev era, under the slogan of chemicalization. Consequently, the necessity for technological and economic cooperation with the West became increasingly urgent. However, up until the mid-1960s, The United States and some member states of NATO were negative toward such engagements and exchanges for security reasons. They even attempted to prevent Western countries like Italy from receiving oil supplies from the Soviet Union and engaging in the export of large diameter pipes and technological cooperation with the Soviet Union. Yet, it became increasingly challenging to prevent cooperation in the petroleum and gas sectors between the Soviet Union and some Western European countries. Notably, in the atmosphere of improving relations between the Soviet Union and West Germany and amidst the spirit of détente, by the late 1960s and early 1970s, it became nearly impossible to continue to sanction the exchange of petroleum, gas, and technological cooperation in both regions. After the first Oil Shock, Soviet petroleum and gas became an essential and urgent commodity for Western European countries, particularly for industrial centers like West Germany. Meanwhile, Soviet Union found West Germany’s high-quality machinery, technical expertise, and management crucial. Subsequently, trade in petroleum and gas between Soviet Union, West Germany, and other Western European countries increased significantly. West German companies became deeply involved in the development of Western Siberian(Urengoy) oil and gas fields and the construction of pipelines to meet this demand. This mutual exchange between the Soviet Union and West Europe, even in the midst of the escalating tensions between the Soviet Union and the United States in the late 1970s and early 1980s, became irreversible to the extent that it could not be undone. In other words, the exchange in the petroleum and gas sectors between the Soviet Union and the West played a crucial role of ‘the long détente’ throughout the Cold War period.