Prime Minister David Cameron has confronted Argentina's president over the Falklands, as the two met on the margins of the G20 summit in Mexico.
Cristina Fernandez de Kirchner attempted to hand Mr Cameron a package marked "UN - Malvinas" but the Prime Minister refused to accept it.
He told her she should respect the decision of the Falkland Islanders on their future in a referendum to be held next year.
Relations between Britain and Argentina are in the deep freeze after Buenos Aires tried to use the 30th anniversary of the Falklands War to revive its claim on the islands it knows as the Malvinas. Britain has rejected calls made by Ms Kirchner to the UN decolonisation committee last week for direct talks to discuss the future of the disputed territory in the south Atlantic.
The tension between the countries has been ramped up during this week's summit after Mr Cameron singled out Argentina for criticism for its protectionist trade policies.
Downing Street aides said the Prime Minister sought out Ms Kirchner to make Britain's position on the Falklands clear. Mr Cameron said: "I am not proposing a full discussion now on the Falklands but I hope you have noted that they are holding a referendum and you should respect their views. We should believe in self-determination and act as democrats here in the G20."
Aides said Mr Cameron gave a "clear and calm message" which he repeated three times as his words were interpreted into Spanish. Ms Kirchner was said to have responded with "ramblings" as she tried to hand the PM the envelope stuffed with documents, but Mr Cameron walked away.
In a speech to a business audience in summit venue Los Cabos, the Prime Minister said G20 countries should be setting an example to the rest of the world by avoiding protectionism and accused Argentina of failing to do so. He cited the case of the nationalisation earlier this year of oil company YPF, which is largely owned by Spanish firm Repsol.
"In the last eight months, we've seen just in one country the expropriation of a multinational company, requirements that export revenues in oil, gas and mining sectors be exchanged in local financial institutions, new regulations on foreign exchange assets of residents, insurance companies required to repatriate foreign assets and limits imposed on investment in farmland," said Mr Cameron.
"And that's just from one G20 member - Argentina. We have to do better than this. We all know that keeping the world economy open, keeping the trade rules fair, is absolutely vital for all our countries. And frankly, the G20 should be setting an example, not providing an example for the world not to follow."
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