JEREMY CORBYN backed a 2013 declaration demanding the UK open talks with Argentina over the Falklands.

And the Labour leader joined an international delegation slamming Britain for putting more troops on the islands.

5 Jeremy Corbyn wanted to re-open talks with Argentina over the Falklands Credit: Getty Images

The Labour leader was the only MP to attend a ‘pro-dialogue’ international summit in London organised by ex-Argentine ambassador Alicia Castro in February four years ago.

In the astonishing declaration, those at the London summit it called on the UK and Argentina to find a “peaceful solution” to the dispute over the Falklands.

It panned the UK for “consistently refusing” to talk and for undertaking “unilateral activities” such as oil exploration around the islands.

5 The declaration from 2013

The declaration added the UK had violated UN rules through the “increasing militarization of the area”. “In view of the above we, the undersigned, call upon the UK government to resume the dialogue with Argentina.”

The Labour leader last week claimed Margaret Thatcher “made a great deal of the whole issue” when General Leopoldo Galtieri invaded the islands in 1982.

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The incendiary comments came during the Sky News leaders debate.

Last year Jeremy Corbyn was said to have told Argentinian diplomats he wanted a Northern Ireland style power-sharing deal for the islands.

Ms Castro said the Labour leader “shares our concerns” and “he is one of ours”.

In an interview published on the Argentinian embassy’s website, Ms Castro said the leftie had visited the embassy and was “friendly and humorous”.

5 Emily Thornberry reacted angrily to attacks on her position on the Falklands from Sir Michael Fallon earlier this month Credit: BBC

5 The MP attended a summit in London to discuss the issue Credit: EPA

She added: “He is saying that dialogue is possible and that attitudes are beginning to change, that was achieved in Northern Ireland and can be achieved here also.

“His decisive leadership can guide the British public opinion to promote dialogue between the governments of the United Kingdom and Argentina.”

5 Jeremy Corbyn's spokesperson said the declaration was to avoid war Credit: Getty Images

A Jeremy Corbyn spokesman said: “This letter simply echoed the UN’s call for British dialogue with Argentina in order to avoid diplomatic incidents and even war. Jeremy has always believed political discussion and engagement is the best way to secure peace and security.”

A source added that Labour’s manifesto had laid bare the party’s commitment on protecting British sovereignty of the islands.