By Nicholas Winning in London and Taos Turner in Buenos Aires 

The U.K. government on Friday confirmed its ambassador in Buenos Aires had been summoned to a meeting at Argentina's foreign ministry, in the latest flare-up of the long-running diplomatic row over the sovereignty of the Falkland Islands that has engulfed oil and gas exploration companies.

The Argentine Deputy Foreign Minister Eduardo Zuain summoned the U.K. ambassador on Thursday to explain a report published by online magazine The Intercept that contended the U.K. had spied on Argentina over the Falklands dispute, the Argentine embassy in London said in a statement. The meeting Thursday came a day after the U.K. had summoned the Argentine ambassador in London.

Argentina continues to lay claim to the U.K.'s overseas territory in the South Atlantic, which are called Las Malvinas in Spanish, and has called for talks to resolve the dispute over which the two countries fought a brief and bloody war in 1982. The prospect of large oil and gas finds off the coast of the islands has served to ratchet up tensions between the two countries in recent years.

During Thursday's meeting, Mr. Zuain notified the U.K. ambassador of Argentina's intention to take legal action that day against companies carrying out hydrocarbon exploration in the waters around the Falklands and he expressed the Argentine government's unease about the U.K.'s plans to spend GBP180 million ($264.83 million) on modernizing its military infrastructure on the islands.

The same day, Argentina filed a criminal complaint with a government body--similar to the Attorney General's office in the U.S.--against several exploration companies, including from the U.K. and U.S., according to the Argentine government. The government said its complaint alleges the companies are breaking the law by engaging in offshore exploration without previously obtaining approval from Argentina's energy secretariat. It added that the complaint also includes criminal accusations against the companies' executives and board members.

"Since 2012 the government has been taking legal steps aimed at protecting the natural resources that fall under its sovereignty and jurisdiction, and at rejecting illegal hydrocarbon activities on its continental platform," Argentina's Foreign Ministry said in a statement on Thursday.

According to the Argentine government, the companies named in the complaint include are: U.K. based Rockhopper Exploration PLC, Premier Oil PLC, and Falkland Oil And Gas Limited. All three companies declined to comment.

The government said the complaint also included U.S.-based Noble Energy Inc. and Edison International Spa, of Italy. Neither was immediately able to comment.

The U.K. Foreign Office on Friday rejected the Argentine legal proceedings.

"We have always been clear that this law does not apply outside of Argentine jurisdiction, but encourage companies who are concerned to get in touch with us and to seek legal advice," it said in a statement.

U.K. Defence Secretary Michael Fallon announced the military investment in late March following a review of the defense needs of the islands, which considered any changes that might arise from the islanders' plans to develop their economy, including oil and gas exploration. In a statement in Parliament he said he had endorsed the U.K. armed forces' assessment that the current military presence on the Falklands was proportionate to the threats and risks that were faced.

The U.K. has repeatedly affirmed its commitment to defend the right of the Falklands to determine their own sovereignty against any threats ever since Argentina's then-ruling military junta invaded the islands on April 2, 1982, before U.K. forces wrestled back control of the islands after a 74-day conflict in which 649 Argentine and 255 U.K. soldiers died.

The U.K. government summoned Argentina's ambassador, Alicia Castro, to a meeting at the Foreign Office in London on Wednesday to express its objection to recent statements she and Argentine President Cristina Kirchner had made about the U.K. military investment on the Falklands.

"The U.K. has no doubt about its sovereignty over the Falkland Islands and surrounding maritime areas, nor about the Falkland Islanders' right to decide their own future," the Foreign Office said in a statement.

The U.K. government declined to comment on The Intercept report, in line with its usual policy of not discussing intelligence matters.

Selina Williams contributed to this article.

Write to Nicholas Winning at nick.winning@wsj.com and Taos Turner at taos.turner@wsj.com

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