Given the following context:

The saddest sight was seeing people behind the wire fences on both sides of the land frontier yelling at the top of their voices across the wide dividing space to enquire about the state of relatives, as telephone communications had been cut by the Spaniards. Local housewives with Spanish relatives in the Campo area kept their radios tuned to the nearby Spanish stations for news of family members who were gravely ill. In critical cases the parties concerned would rush to Spain via Tangiers but unfortunately sometimes the patient was dead and buried by the time they arrived. The Spanish authorities would not allow access across the land frontier even on compassionate grounds.
Franco's death in 1975 led to the beginnings of diplomatic movement between Britain and Spain on the Gibraltar issue, though not immediately. Spain applied to join the European Economic Community (EEC) and NATO, for which it needed British support. In 1980, talks between British and Spanish ministers led to the Lisbon Agreement, a statement on co-operation between the two countries which committed them to starting negotiations on Gibraltar's future and lifting the Spanish restrictions on communications with Gibraltar. Although Britain promised to "honour the freely and democratically expressed wishes of the people of Gibraltar", Prime Minister Margaret Thatcher indicated in the House of Commons that sovereignty would be on the table, in a change from the previous policy. However, the border was not reopened due to "technical issues" – code for unresolved issues between the two governments – and the agreement was strongly opposed by many Gibraltarians, who did not wish their sovereignty to be under discussion and objected to the lack of Gibraltarian representatives at the talks. The outbreak of the Falklands War in 1982 caused a further delay. Argentina carried out an unsuccessful sabotage operation, kept secret at the time, that was intended to sink a Royal Navy frigate in Gibraltar's harbour; the saboteurs were captured by the Spanish...

answer the following question:

What war broke out causing a delay in discussions over the location that had Spanish restrictions on communications? 

Falklands War