A Foreign and Commonwealth Office spokesman has issued a firm rebuttal of Argentinian claims that military exercises on the Falklands amount to "provocation".
Deputy foreign minister Eduardo Zuain has summoned the British Ambassador in Buenos Aires in a protest over a planned military exercise on the Falkland Islands next week.
A spokesman for the Embassy of Argentina in London said: "The Government of the United Kingdom will conduct military exercises on occupied Argentine territory between 14 and 27 April, including missile launchings from the Malvinas Islands.
"This action falls within a pattern already denounced by President Cristina Fernandez de Kirchner on 2 April, consisting of provocations and hostile acts towards Argentina from an extra-continental nuclear power."
Argentina has accused the UK of provocative behaviour by planning military exercises in the Falkland Islands next week.
Deputy foreign minister Eduardo Zuain summoned the British ambassador in Buenos Aires to protest over the "new show of military force".
It is the latest diplomatic clash following heightened tensions over the territory since Cristina Fernandez de Kirchner took power in Argentina.
Argentina's president has taken her country's claim to the Falkland Islands to the United Nations, challenging Britain to "act more intelligently" and sit down to talk about the future of the Islands.
In a highly emotional speech President Cristina Fernandez de Kirchner chose to appear at the little-known UN Decolonisation Committee on the 30th anniversary of Britain's ousting of an Argentinian invasion force from the Falklands.
The president used the occasion to reiterate Argentina's opposition to any more wars and to criticise the prime minister's decision to mark the day by flying the Falklands flag over his official 10 Downing Street residence.
Speaking about the hundreds of deaths in the 74-day conflict over the islands, she said: "I felt shame from far away for them because wars are not to be celebrated or commemorated."
The Secretary-General and President Fernández discussed the issue of the Falkland Islands (Malvinas).
The Secretary-General acknowledged the strong regional support for this issue and reiterated that his offices are still keen to work to resolve this dispute, but the parties must be willing to engage.
Delegates are beginning to the gather inside the United Nations in New York for the meeting on the future sovereignty of the Falklands.
Argentine President Christina Kirchner is expected to call for the Falklands to be returned to Argentina.
Islanders have travelled to the UN to assert their right to self determination.
Thirty years to the day after the Falklands war ended, the Argentine President will be ramping up the rhetoric over her country's claim to the islands at the United Nations. Cristina Kirchner's speech will be symbolic, coming on the anniversary of the day hostilities ended.
Our Washington Correspondent Robert Moore reports from the UN in New York.
Islanders, veterans and members of the armed forces marked the 30th anniversary of the liberation of the Falkand Islands today at a service of thanksgiving held at Stanley's Christ Church Cathedral.
Around 400 islanders braved the stormy conditions to pay tribute to their dead.
The war ended on June 14 1982 after Argentinian commander General Mario Menendez surrendered at Stanley.
225 British serviceman, three Falkland Islanders and 655 Argentinian soldiers lost their life in the conflict.
The service was attended by Foreign Officer minister Jeremy Brown.
A group of Falkland Islanders have travelled to the United Nations building in New York to hear President Cristina Fernández de Kirchner argue that the islands should belong to Argentina.
Two members of the islands' Legislative Assembly are hoping to address the UN's decolonisation committee to say they want Argentina to leave them alone. Islander Mike Summer said the committee should put the wishes of the people who live there before the interests of anyone else:
"Their responsibility is not to the United Kingdom or to Argentina. It is to the people of the self-governing British territory."