Falkland Islanders are to vote in a referendum on the future sovereignty of their south Atlantic homeland.
The Falkland Islands Government said it hopes the vote - to be held early next year - will send a firm message to Argentina that islanders want to remain British.
Three decades after Margaret Thatcher sent 27,000 troops and more than 100 ships to expel Argentinian invaders, Buenos Aires continues to set its sights on claiming the territory it calls Las Malvinas.
Argentine president Cristina Fernandez de Kirchner will restate her country's claim before the United Nations Decolonisation Committee on Thursday, the 30th anniversary of the liberation of the islands.
Gavin Short, chairman of the Falklands Legislative Assembly, said: "We are holding this referendum not because we have any doubts about who we are and what future we want, but to show the world just how certain we are about it.
"I have no doubt that the people of the Falklands wish for the islands to remain a self-governing overseas territory of the United Kingdom.
"We certainly have no desire to be ruled by the government in Buenos Aires, a fact that is immediately obvious to anyone who has visited the islands and heard our views."
Prime Minister David Cameron said: "Next year's referendum will determine beyond doubt the views of the people of the Falklands. Britain will respect and defend their choice.
"We look to all UN members to live up to their responsibilities under the UN Charter and accept the islanders' decision about how they want to live."
He added: "I have always said that it is up to the Falkland Islanders themselves to choose whether they want to be British and that the world should listen to their views."