Under Secretary of State Thomas G. DiNanno

Official Account of the Under Secretary of @StateDept for Arms Control and Int'l Security (T).

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

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.

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Historic milestone for AUKUS. Today we announced our first Pillar II signature project: cutting-edge payloads and systems for UUVs, with delivery in 2027. This is how AUKUS delivers advanced capability at pace to meet challenges and strengthen deterrence in the Indo-Pacific. 🇺🇸🇦🇺🇬🇧 Joint Statement: https://t.co/NkULAUXLNa

[Secretary of War Pete Hegseth @SecWar]

Good to see DPM @RichardMarlesMP and Secretary @JohnHealey_MP for the AUKUS Defense Ministers’ Meeting.

At President Trump’s direction, we are moving “full steam ahead.”

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Pleased to meet with Belgium's Director General for Multilateral Affairs, Veronique Petit, and Ambassador Frederic Bernard. We shared perspectives on counterterrorism, nuclear non-proliferation, artificial intelligence, and other ways we are coordinating to make our citizens safer. 🇺🇸🇧🇪

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Constructive meeting yesterday with Poland's Deputy Minister of Defense, Pawel Bejda, Ambassador Bogdan Klich, and Attaché MG Krzysztof Nolbert, to discuss the America First Arms Transfer Strategy. 🇺🇸🇵🇱

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

The failure of States Parties to produce an agreed outcomes document from the 2026 NPT Review Conference is regrettable and alarming. Serial violators such as Iran must not be allowed to become a barrier to the functioning of this crucial international body. https://t.co/KSiFinNI9Q

[U.S. Embassy Tallinn @USEmbTallinn]

Honored to bring a high-level American delegation to the 19th annual Lennart Meri Conference.

Under Secretary Thomas G. DiNanno:

“There’s 4 bilateral U.S. ambassadors here, and if that doesn’t tell you about U.S. commitment to the region, I don’t know what will. We are not going anywhere.”

[Cezary Tomczyk @CTomczyk]

Dziękuję wszystkim, którzy byli zaangażowani w ostatnią misję rządu @donaldtusk w USA oraz działania dyplomatyczne tutaj, w Polsce. W sprawach najważniejszych Prezydent, Premier, ministrowie i posłowie mówią jednym głosem.

Dziękuję administracji amerykańskiej i @realDonaldTrump za decyzję o zwiększeniu obecności wojskowej, a także wszystkim kongresmenom i senatorom, zarówno republikańskim, jak i demokratycznym, za wsparcie polskiej sprawy.

Dziękuję osobiście @UnderSecT oraz @RepMikeTurner a także Andrew Baker z Białego Domu oraz @emilmichael za całe wsparcie dla polskich spraw.

Niech żyje Polska! 🇵🇱

[US Dept of State INL @StateINL]

Costa Rica’s INL-supported Coast Guard interdicted two vessels in the Pacific and seized 3.3MT of cocaine in just 24 hours. This year, its Coast Guard has seized 24.5MT of illicit drugs--4x the amount seized during the same period in 2025. 🇺🇸🇨🇷 security cooperation helps to protect our shores and our communities.

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

To turn financial investments into military capabilities Europe must meet its 5% GDP commitments, resist protectionist & exclusionary barriers to expanding production, and implement NATO 3.0. 🇺🇸 🇷🇴

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

At #B9Summit @UnderSecT spoke of Europe's need to rebuild its defense industrial base, critical infrastructure, & supply chains. The Ankara Summit will be a test of NATO's ability to turn commitments into capabilities. 🇺🇸 🇷🇴

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Thank-you, @NicusorDanRO , for inviting the United States as an observer at this timely and productive meeting of the B9.

[Nicușor Dan @NicusorDanRO]

Le-am urat bun venit la București liderilor statelor membre B9, invitaților și prietenilor noștri nordici, Secretarului General al NATO și le-am mulțumit pentru prezență SUA și Ucrainei, care au participat ca observatori.
Dialogul nostru are loc într-un context internațional dinamic, cu două luni înainte de un moment important pentru noi toți, Summitul NATO de la Ankara. Organizarea reuniunii de astăzi la București, aproape de Ucraina, de Marea Neagră și în proximitatea amenințărilor ruse la adresa teritoriului aliat este cu atât mai semnificativă.
Scopul Summitului nostru este de a coagula o abordare unitară despre viitorul NATO. Pentru fiecare dintre țările noastre există o prioritate pentru propria securitate și există o prioritate pentru consolidarea securității transatlantice. De aceea, motto-ul acestei reuniuni este să oferim mai mult pentru securitatea transatlantică.
Pentru a ne îndeplini aceste obiective este necesar să creștem cheltuielile dedicate apărării, pe care trebuie să le transformăm în capabilități, să sporim contribuția aliaților europeni la NATO și să dezvoltăm împreună o bază industrială militară transatlantică solidă.
Întâlnirea de astăzi ne oferă oportunitatea de a vedea unde suntem în implementarea angajamentelor pe care ni le-am luat la Summitul NATO de la Haga și de a reafirma sprijinul nostru pentru Ucraina și Republica Moldova. De securitatea lor depinde securitatea noastră.
#SummitulB9 #FlanculEstic #SecuritateTransatlantică

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Arriving in Romania to represent the United States at the B9 Summit. Bună seara, București!! 🇺🇸🇷🇴@AmbasadaSUA

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Important briefing yesterday by @ORLEN_Synthos, partnered with @GEVernova and @SGE_Nuclear, about their efforts to build small modular reactors to enhance Poland’s energy security.

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Thank you @RKupiecki and @ZalewskiPawel for hosting my delegation for in-depth discussions on U.S.-Poland defense cooperation and how our countries work together in today's challenging geostrategic environment. 🇺🇸 🇵🇱

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Yesterday, I met with @USChamber defense committee members in Poland to discuss EU defense protectionism, the America First Arms Transfer strategy, Foreign Military Sales reform, co-production, and defense innovation. 🇺🇸 🇵🇱

[US Dept of State INL @StateINL]

With INL support, these interceptor vessels were delivered to our partners in Ecuador to strengthen maritime security and confront transnational threats before they reach U.S. shores. 🇺🇸🇪🇨

[State ACN Bureau @StateACN]

All #NPT States Parties should be concerned with Iran’s flagrant violation of the treaty. To defend the foundation of the nonproliferation regime, all NPT States Parties should use the RevCon to defend the treaty and the safeguards system. The time is now, and the need is urgent.

[State ACN Bureau @StateACN]

On April 28, @StateACN Assistant Secretary Dr. Christopher Yeaw delivered the U.S. national statement to the #NPT Review Conference. Now is the time to ensure the NPT regime is prepared to face the challenges of today and those of tomorrow. https://t.co/VMACyJL9ri

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

His Majesty King Charles’s historic gift of the ship’s bell from the HMS Trump links the past to the future. HMS Trump served during World War II in the UK’s 4th Submarine Squadron based in Perth, Australia — the location of today’s Submarine Rotational Force - West. From Pacific War heroics to joint submarine rotations in the face of new challenges, the AUKUS bond is deeper than ever. @UKRoyalNavy_ @Australian_Navy

[The White House @WhiteHouse]

King Charles III presents President Trump with the original bell from the HMS Trump - a valiant WW2 era warship! 🇺🇸🇬🇧

[Under Secretary of State Thomas G. DiNanno @UnderSecT]

Excellent meeting with @Israel_MOD Director of the Policy & Political-Military Bureau, Itmar Graff. Grateful for our partnership.