The following is a chronology of West German-Soviet economic relations:

Feb. 1, 1970--Ruhrgas, Mannesmann and Deutsche Bank announce the first 20-year gas purchase agreement with the Soviet Union, with Mannesmann supplying 1.2 million tons of pipe and the bank providing $500 million in credits.

Aug. 12, 1970--Agreement to expand economic relations.

Oct. 29, 1974--New gas, pipe and credit agreement.

Oct. 30, 1974--Agreement on further economic cooperation.

Dec. 19, 1975--West German bank consortium announces a $500 million credit.

May 6, 1978--Soviet President Leonid Brezhnev and West German Chancellor Helmut Schmidt sign a 25-year economic coooperation agreement. Krupp Koppers signs to build a polyester fiber plant. Krupp Steel agrees to deliver cranes.

July 21, 1981--West German banking consortium agrees to provide up to $1.8 billion to finance export of compressors and turbines for the Siberian pipeline.

October 1981--A West German-French consortium agrees to supply $1 billion of compressors, turbines and engineering for Siberian pipeline.

Nov. 21, 1981--Ruhrgas, for a consortium, contracts to buy 10.5 billion cubic meters of natural gas starting in 1984.

Dec. 13, 1981--Martial law in Poland.

Dec. 29, 1981--United States bans sale of oil and gas equipment and technology to the Soviet Union.

January 1982--Mannesmann signs a new pipe order with the Soviets.

March 11, 1982--Bonn discloses it approved $517 million of credit insurance guarantees for sales to Soviets since Jan. 1.