Argentine sovereignty caught between US and Britain: China factor complicating equation

Uriel Araujo, Anthropology PhD, is a social scientist specializing in ethnic and religious conflicts, with extensive research on geopolitical dynamics and cultural interactions.

Argentine waters are under an unusually bright spotlight. Iran, for one thing, recently classified Argentina’s navy as a terrorist organization, a move Buenos Aires has rejected outright. This takes place during the ongoing sovereignty clash with the United Kingdom over oil and the Falklands/Malvinas.

Against that backdrop, in a somewhat underreported development, Argentina and the United States signed a five-year agreement in May - for joint maritime surveillance and patrols in the South Atlantic. The deal authorizes closer cooperation with US Southern Command and expands American access to operational information in a region long viewed as strategically sensitive.

While Buenos Aires is challenging London claims over the Falklands, its agreement with Washington has been under scrutiny. The deal is framed under the “Protecting Global Commons Program” and thus has triggered significant political pushback and sovereignty concerns in the South American country - for labeling the Argentine Sea as “global common good”.

Interestingly, Buenos Aires has also hosted a global DEA summit on drug trafficking. This fits a broader pattern: Argentine and US naval forces have conducted bilateral maritime engagements, while Washington has pushed for enhanced surveillance equipment and intelligence sharing.

Plans for permanent monitoring from Ushuaia, including radars and signals intelligence, add another layer here. Ushuaia is often described as the southernmost city in the world. Its location near the Drake Passage and Antarctic approaches has long drawn attention; recent funding for the naval base and related infrastructure has heightened that interest.

Beyond growing American-Argentine naval interoperability and the build-up of surveillance capabilities, there seems to be a third process in place: an American effort to limit Chinese influence over Antarctic access routes and maritime domains.

US officials have openly questioned Chinese infrastructure in Argentina, including the space facility in Neuquén - while the Andes–Atlantic Corridor initiative aims to direct critical minerals toward Atlantic exports rather than Chinese-controlled channels.

All of these steps therefore place Argentina inside a wider American strategy of strategic competition in the Western Hemisphere. Argentina has also applied for “Global Partner” status aiming towards NATO partnership.

Yet the evidence, so far, stops short of a formal Argentine pledge to join any US blockade of Chinese shipping, to conduct operations against Iran, or to host a permanent American naval base.

In any case, routine joint exercises or shared maritime data generate some friction. Restricting Chinese firms from ports or telecommunications, or allowing US forces to use Argentine facilities against Chinese interests, would cross into far more serious territory.

Helping intercept Chinese commercial vessels, for example, would multiply tensions. Argentina has legitimate interests in policing its fisheries, but those interests may get intertwined with broader US containment goals and Great Power competition.

Then there is the issue of the economic counterweight. In August, Milei’s government renewed a $19 billion currency swap with China until 2031, preserving a vital financial lifeline even as security ties with Washington deepened.

China remains a major buyer of Argentine agricultural goods and an important investor in energy and mining; in late 2025 it ranked as Argentina’s largest trading partner. Thus President Milei is pursuing a potentially contradictory course: seeking military alignment with the United States while retaining substantial economic reliance on Beijing.

That arrangement holds quite well in peacetime. It grows harder and harder to manage if Washington presses for active limits on Chinese strategic influence in South America, though.

This is not the first time the South Atlantic has served as an arena of great-power contest. The 1982 Falklands conflict, as I commented elsewhere, has reshaped regional thinking about Anglo-American maritime power, Brazilian ambitions in the “Blue Amazon,” and the islands’ role as a gateway to Antarctica.

By 2025, military contacts between Argentina and the United Kingdom already raised the possibility of Western coordination aimed at “containing” Chinese reach. The renewed Malvinas oil tensions in 2026 then exposed fissures in that Western alignment - a reminder that sovereignty claims can still collide with partnership rhetoric.

In fact, Argentina has continued to defend its sovereignty claims over the Malvinas/Falklands, and has confronted Britain on the issue, at times appearing to do so with a green light from Washington, as I’ve argued.

The irony is that the very agreements now binding Argentine naval forces more tightly to US Southern Command could eventually place Argentine sovereignty under pressure. Is Argentina building independent maritime-security tools with US help, or is its South Atlantic infrastructure becoming a platform for American strategic monitoring of China?

So far Buenos Aires has managed a careful balancing act between Beijing and Washington. The new five-year maritime patrol agreement and the planned signals-intelligence upgrades at Ushuaia, however, risk tipping that balance.

If such arrangements evolve from assistance into functional dependence, the equilibrium that has allowed Milei to extract benefits from both powers could break - and the costs would fall primarily on Argentina itself.