Chile and Argentina Form “Ultra-Conservative” Alliance in Buenos Aires

In a move that marks a massive realignment of South American geopolitics, Chilean President José Antonio Kast and Argentine President Javier Milei have signed a sweeping joint declaration that cements a new “ideological partnership” between the neighboring nations.

The summit, held at the Casa Rosada on April 7, 2026, was Kast’s first international trip since his inauguration, signaling a prioritisation of regional security and shared libertarian values.

Sovereignty Support: The Falklands Declaration

The most striking diplomatic takeaway was President Kast’s formal backing of Argentina’s sovereignty claim over the Falkland Islands (known as the Malvinas in Argentina), as well as South Georgia and the South Sandwich Islands.

In the joint communiqué, Kast reiterated Chile’s support for Argentina’s “legitimate sovereign rights” and called for the United Kingdom to resume peaceful negotiations in accordance with United Nations resolutions. While Chile has historically supported Argentina’s position, the timing and emphasis of this declaration—coming just days after Milei’s high-profile Malvinas Day ceremony—underscore a newfound level of diplomatic coordination.

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A Joint Front Against Organized Crime

Beyond sovereignty, the two leaders announced a robust joint security alliance aimed at tackling transnational organized crime and improving border safety. Key pillars of the agreement include:

• Intelligence Sharing: Real-time data exchange to combat narcotics and human trafficking along their shared 3,300-mile border.
• Border Digitalization: Modernizing and digitalizing control procedures at key mountain passes to improve efficiency and security.
• The “Tigon” Factor: Discussions also touched on Chile’s recent armored vehicle modernization, with potential for regional industrial cooperation in defense tech.

The “Extradition” Test

The alliance is already facing a high-stakes practical test. President Kast explicitly called for the extradition of Galvarino Apablaza, a former guerrilla leader accused of a 1991 political assassination in Chile, who has lived in Argentina for decades. In a show of solidarity, the Milei administration has offered a $14,000 reward for information leading to his capture, signaling that the “ideological bridge” between Santiago and Buenos Aires is built on tangible law-and-order cooperation.

Economic Integration and “Shared Liberty”

The meeting wasn’t solely focused on defense. Both leaders, who are vocal allies of former U.S. President Donald Trump, framed their agenda within the “defense of liberty, life, and property.” They outlined plans to boost bilateral trade—already totaling nearly $8 billion—with a specific focus on mining and energy integration in the lithium-rich Andean regions.

As South America shifts toward a rightward political pole, the Milei-Kast alliance creates a formidable bloc that could redefine trade and security dynamics in the Southern Cone for the next decade.