In June 1982 , these sanction were expanded to cover also subsidiaries of the American companies in Europe .
In December 1981 , the United States implemented sanctions prevented U.S. companies to export oil and gas technologies , necessary for the pipeline construction , to the Soviet Union .
In June 1982 , these sanction were expanded to cover also subsidiaries of the U.S. companies in Europe .
In December 1981 , the United States implemented sanctions prevented U.S. companies to export oil and gas technologies , necessary for the pipeline construction , to the Soviet Union .