Thirty years ago, Argentine naval forces invaded the Falkland Islands, starting a 10-week war with Britain for control of the territory.

Argentina's president, Cristina Fernandez de Kirchner, has in recent months stepped up a diplomatic battle with London, reasserting Argentine claims to sovereignty over the Malvinas, as they are called in Argentina.

Her government has threatened to sue companies looking for oil off the Falklands and it has won some degree of support from other countries in the region.

World affairs editor, John Simpson, reports from the Argentine capital, Buenos Aires.

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