BUENOS AIRES, Argentina, March 3, 1982 (UPI) -- Argentina is threatening to break diplomatic relations with Britain if the Falkland Islands are not handed back by next year's 150th anniversary of the British presence on the islands, a Foreign Ministry source said Wednesday.

Where are the Falkland Islands?

LONDON, April 2, 1982 (UPI) -- Britain broke off diplomatic relations with Argentina Friday for seizing the Falkland Islands and warned that its naval forces racing to the area would defend the South Atlantic crown colony by force.

LONDON, April 3, 1982 (UPI) -- Prime Minister Margaret Thatcher faced a bleak choice Saturday in the crisis triggered by Argentina's seizure of the Falkland Islands.

WASHINGTON, April 3, 1982 (UPI) -- The United States is walking a narrow line on the Falkland Islands crisis, urging Argentina to withdraw its troops but remaining neutral on whether the South Atlantic islands belong to Argentina or Britain.

UNITED NATIONS, N.Y., April 3, 1982 (UPI) -- The U.N. Security Council passed by a 10-1 vote Saturday a British-sponsored resolution demanding the immediate withdrawal of all Argentine forces from the captured Falkland Islands.

LONDON, April 4, 1982 (UPI) -- The largest British war fleet assembled since the 1956 Suez crisis completed preparations Sunday to set sail for the south Atlantic and a possible war with Argentina over the Falkland Islands.

Highlights of military action in the Falkland Islands war between Britain and Argentina:

Feb. 26-27 -- Argentina and Britain meet routinely in 17-year-long negotiations on Falkland Islands sovereignty.

BUENOS AIRES, Argentina, June 14, 1982 (UPI) - Where war fever reigned supreme just days ago, a dark mood of bitterness and dejection hung over the streets of Buenos Aires Monday.

LONDON, June 14, 1982 (UPI) -- Prime Minister Margaret Thatcher, beaming after announcing a cease-fire in the Falklands Monday to a cheering Parliament, joined a crowd of noisy patriots singing ''Britannia Rules the Waves'' outside her residence.

British troops routed Argentine defenders on the outskirts of Stanley Monday and white flags over the besieged capital of the Falklands signaled the start of surrender talks to end the 73-day war over the desolate South Atlantic islands.

The 73-day war for control of the Falkland Islands is estimated to have cost hundreds of Argentine and British lives.