London — Adding to her EU divorce dramas, Prime Minister Theresa May is heading to the G-20 summit in Argentina, a country using Brexit to advance its claim on Britain’s Falkland Islands. The visit, the first by a British premier to the Argentinian capital since the 1982 Falklands War between the two countries, is being seen in Buenos Aires as a chance to improve ties. However, the 3,400 Falkland Islanders insist their British sovereignty remains non-negotiable and say a proper thaw in their relations with Argentina remains distant. They have reason to be worried about Brexit: if Britain leaves the EU without a deal, the Falklands' economy — heavily reliant on tariff-free squid exports to EU member Spain — could face a hammer blow. Argentinian foreign minister Jorge Faurie made waves in October, saying Buenos Aires would exploit Brexit to enhance its diplomatic push for the Falklands. Britain's sovereignty claim to the islands, known in the Spanish-speaking world as the Malvinas, da...

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