Under Secretary of State Thomas G. DiNanno

I'm honored to serve as Under Secretary for Arms Control & Int'l Security & grateful to @POTUS & @SecRubio for their confidence. Alongside the talented professionals of the bureaus and offices within my remit, I will faithfully execute @POTUS 's mission of achieving peace through strength. Stay tuned for updates on how we’re tackling the tough security challenges of the day.

Met with Chilean Defense Minister Fernando Barros today to discuss expanding military relations between our two countries. Proud to be Chile’s strategic security partner of choice in protecting our people from bad actors. 🇺🇸🇨🇱

Fascinating visit to the Vera Rubin and Gemini Observatories to watch how science can serve humanity. By deepening space cooperation with Chile, we’re defending a free, secure space domain for everyone and pushing back against malign activities. 🇺🇸🇨🇱

Thank you to my colleague and friend @DutchMFA Political Director Marcel de Vink for our great discussion focusing on key bilateral and alliance issues.

Productive meeting today with Admiral Sam Paparo, 27th Commander of @INDOPACOM – working closely together to strengthen deterrence and promote stability in the Indo-Pacific.

Pleased to host today the delegation led by the Political Director of the Ministry of Foreign Affairs of Latvia, Ivars Lasis. Our discussions focused on expanding U.S.-Latvia cooperation across arms control and deterrence strategies.

INL-supported partners in Jamaica and @DEAHQ interdicted a vessel southeast of Treasure Beach, seizing over 2,700 kg of cocaine—the largest cocaine seizure in Jamaica’s history. Three narco-traffickers were arrested. 🇺🇸🇯🇲 cooperation stops dangerous drugs before they reach U.S. shores.

Pleased to meet with Australian Deputy Secretary for AUKUS Kendra Morony. We’re making good progress on global security goals shared by the USA, Australia, and the United Kingdom. 🇺🇸🇦🇺🇬🇧

Thrilled to announce the completion of the U.S.-El Salvador 123 Agreement negotiations with @Daalvarezc today. Along with @MilenaMayorga, committed to work together on necessary steps prior to signing and bringing agreement into force. This milestone strengthens 🇺🇸🇸🇻 bilateral partnership, advances energy security, and supports economic cooperation! @USEmbassySV #USElSalvador #EnergyDiplomacy

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CAPTURED. Sebastian Marset’s reign of terror and chaos is over. Thanks to President @Rodrigo_PazP's leadership and rapidly strengthening U.S.-Bolivia law enforcement cooperation, notorious drug trafficker Marset will face justice. The Shield of the Americas is making our region safer and stronger.

At #CND69 in Vienna, we're calling on countries to drive down illicit drug supplies at the source, as the Trump Administration is doing, and to ruthlessly scrutinize funded programs to ensure real impact.

Useful conversation w/Thomas DiNanno, @UnderSecT for Arms Control & Int’l Security on deepening 🇦🇲-🇺🇸 strategic partnership in various directions. Emphasized readiness to sign the 123 Agreement on Nuclear Energy. Touched upon regional infrastructure projects.

On the margins of the @iaeaorg Nuclear Energy Summit #NES2026, I also held fruitful discussions with bilateral nuclear energy partners to discuss the mutual benefits of the Trump Administration's four executive orders jump-starting the 🇺🇸 nuclear energy renaissance.

Yesterday, I attended the @iaeaorg Nuclear Energy Summit to deliver remarks on behalf of the USA. “We must strengthen the global nuclear energy supply chain so that no nation is forced to rely on unsafe or coercive alternatives.” Thanks to U.S. Department of @ENERGY and @WhiteHouse Chief Technology Office for support. #NES2026

In my meeting with @rafaelmgrossi, we discussed how the United States and @iaeaorg collaborate on some of the world’s toughest challenges.

Met Monday with my French counterpart, Claire Raulin, Director for Strategic Affairs, Security, and Disarmament at the French Ministry for Europe and Foreign Affairs for the 🇺🇸 🇫🇷 Deterrence, Strategic Stability and Non-Proliferation Dialogue in Paris. We discussed a range of nuclear related issues as well as the current strategic challenges facing our two countries. state.gov/releases/offic…

The Sudanese Muslim Brotherhood, trained and supported by Iran’s Islamic Revolutionary Guard Corps, has been designated by @StateDept as a Foreign Terrorist Organization and Specially Designated Global Terrorist for mass executions of civilians. We will continue to use all available tools to deprive the Iranian regime and Muslim Brotherhood chapters of the resources they need to engage in or support terrorism.

Productive meeting with @GermanAmbUSA Hanefeld this morning. 🇺🇸 and 🇩🇪 reiterated our unwavering commitment to extended nuclear deterrence in @NATO and to the trans-Atlantic cooperation essential to U.S. strategic security. Our pursuit of new, improved, and modernized nuclear arms control strategies after New START will benefit U.S. and European security.