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Gregory Koblentz

@gregkoblentz

I research, teach, and write about about the causes and consequences of the proliferation of nuclear, biological, chemical, and radiological (CBRN) weapons to states and terrorists. Views are my own.

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Latest posts by Gregory Koblentz @gregkoblentz

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The Pandora Report Where Science Meets Security

Pandora Report 3.6.2026

This issue highlights evolving chemical and biological weapons risks, update on H5N1 in the US and Cambodia, shifting leadership in U.S. public health institutions, and the growing intersection of biotechnology, AI, and biosecurity governance.

www.pandorareport.org

06.03.2026 14:27 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Strikes on Iranian Nuclear Sites Signal Resolve To End Tehran’s Nuclear Weapons Program Four strikes on Iranian nuclear facilities during the current U.S.-Israeli military campaign underscore both allies’ determination to eliminate Iran’s remaining pathways to nuclear weapons. The...

Strikes on Iranian Nuclear Sites Signal Resolve To End Tehran’s Nuclear Weapons Program

www.fdd.org/analysis/202...

05.03.2026 17:16 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

So nothing can get in or out but the facility may also be too deep for destruction, even by MOPs (US had to use 12 against Fordow). Without return of IAEA inspectors, Iran will retain unsafeguarded latent nuclear capability.

05.03.2026 15:32 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Key takeaway is that IAEA believes Iran's HEU is stored in a tunnel complex at Isfahan, which Iran declared as an enrichment facility but IAEA has never inspected, that is twice as deep as the Fordow enrichment site and the entrances have all been buried by Iran.

05.03.2026 15:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

The entrances to the underground facility at Isfahan are 600 feet/180 meters below the mountain peak (per ISIS report) which is approximately twice as deep as Fordow, which was struck with 12 GBU-57A/B Massive Ordnance Penetrators in June 2025.

05.03.2026 15:25 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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An Iranian Nuclear Site Avoids New Airstrikes, for Now

As of March 3, the site had not been struck by the US or Israel

www.nytimes.com/2026/03/03/w...

05.03.2026 15:20 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Imagery Update: All Entrances to Esfahan Tunnel Complex are Now Completely Buried | ISIS Reports | Institute For Science And International Security

In early February, Iran completely buried the three entrances to the tunnel complex/IFEP indicating this was a high value site they sought to protect from airstrikes.

isis-online.org/isis-reports...

05.03.2026 15:14 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Iran's storage of its 20% and 60% HEU at this site, coupled with potential enrichment capability at this site, is concerning and would have been the highest priority site for IAEA to inspect under the (never implemented) Cairo Agreement.

05.03.2026 15:11 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Since Iran claims the IFEP was attacked in June 2025 and the tunnel complex at Isfahan is known to have been attacked at that time, it is reasonable to infer Iran had built, was building, or planned to build an enrichment facility inside the tunnel complex.

05.03.2026 15:09 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Imagery Update on the Esfahan Tunnel Complex | ISIS Reports | Institute For Science And International Security The PPI Visualization Tool represents key results from our in-house comprehensive and in-depth ranking of the effectiveness of national strategic trade controls.

Details on this tunnel complex, which was built in 2005 and upgraded in 2020-2021 can be found here: isis-online.org/isis-reports...

05.03.2026 15:08 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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IAEA believes that the 184 kg of 20% HEU and 441 kg of 60% HEU is stored at "the tunnel complex at Isfahan."

05.03.2026 15:02 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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IAEA cannot provide update on status of Iran's declared enrichment facilities since it has not had access to them since June 2025.

05.03.2026 14:59 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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IAEA assess that 7 declared facilities were subject to military attack plus Iran has claimed the Isfahan Fuel Enrichment Plant (IFEP) it declared on June 12 was also attacked. IAEA has never visited the IFEP.

05.03.2026 14:57 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Iran has not provided access to any of the fuel cycle facilities attacked in June 2025 despite the September 2025 Cairo agreement on β€˜Practical Steps on Safeguards Implementation in Iran pursuant to the NPT Safeguards Agreement following the armed attacks on its safeguarded nuclear facilities’

05.03.2026 14:54 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Latest IAEA report on status of Iran's nuclear program. Highlights to follow
www.iaea.org/sites/defaul...

05.03.2026 14:51 πŸ‘ 1 πŸ” 1 πŸ’¬ 1 πŸ“Œ 2
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ODNI MIA on HEU
Iran Nuclear Weapons Capability and Terrorism Monitoring Act in the FY23 NDAA directs the DNI to provide Congress and the public with unclassified reports on the status of Iran's nuclear program every 6 months. Last update provided in March 2025.

www.congress.gov/bill/117th-c...

05.03.2026 14:20 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Per the FY23 NDAA, ODNI is required to submit unclassified reports to Congress and public every 6 months on the status of the Iranian nuclear program. So Gabbard should have released 2 such reports since the March threat assessment. Where are they?
www.congress.gov/bill/117th-c...

05.03.2026 14:16 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Takeshi Ebisawa Sentenced To 20 Years In Prison For Conspiring To Traffic Nuclear Materials, Narcotics, And Firearms

www.justice.gov/usao-sdny/pr...

05.03.2026 05:04 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

This is playing with fire...

05.03.2026 02:40 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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This is a problem:
"AI-enabled synthesis and retrosynthesis capabilities are provided by a heterogeneous set of vendors and some are offered with limited or no user verification."

05.03.2026 01:38 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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OPCW Science Advisory Board has issued its report on #AI, chemistry, and chemical weapons.

www.opcw.org/sites/defaul...

05.03.2026 01:36 πŸ‘ 7 πŸ” 3 πŸ’¬ 1 πŸ“Œ 1

Good plan, there’s no way that the US would ever betray Kurds who fought on their behalf, or that Turkey would be upset by and seek to frustrate any US-backed Kurdish forces, or that an invasion from Iraq would trigger Iranian nationalist opposition. None of those things have ever happened.

04.03.2026 21:42 πŸ‘ 892 πŸ” 263 πŸ’¬ 30 πŸ“Œ 13
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Video: U.S. official tells Fox News that thousands of Iraqi Kurds launched a ground offensive in Iran.

04.03.2026 21:24 πŸ‘ 84 πŸ” 24 πŸ’¬ 22 πŸ“Œ 26
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Start Planning Now to Secure CBRN Materials in Iran β€’ Stimson Center Another Nuclear Security Crisis When the Soviet Union ended, a forward-looking group of U.S. lawmakers and statesmen had been planning for months how to ensure that Soviet nuclear weapons were safe an...

Start Planning Now to Secure CBRN Materials in Iran
@stimsoncenter.bsky.social @cupitt.bsky.social

www.stimson.org/2026/start-p...

04.03.2026 21:38 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Stockpiles, Countermeasures, and Deterrence: A Blueprint to Fix America’s Biodefense Gap

www.realcleardefense.com/articles/202...

04.03.2026 17:57 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

As the laid off Middle East News Editor, I concur. Management eliminated the positions of every single staff correspondent and bureau chief in the Middle East.

02.03.2026 20:39 πŸ‘ 8045 πŸ” 2215 πŸ’¬ 122 πŸ“Œ 71
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a blurry image of a person sitting on a bed ALT: a blurry image of a person sitting on a bed

French nuclear strategists

02.03.2026 20:55 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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a man in a suit and glasses is saying `` i cast you out , unclean spirit '' . ALT: a man in a suit and glasses is saying `` i cast you out , unclean spirit '' .

Macron

02.03.2026 20:55 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Everyone I have spoken to believes Trump is in way over his head on this, Hegseth and his team are making matters worse not better, and that this is more a war of impulse and ignorance than it is a war of choice. We've never been in such a situation and so adrift and leaderless.

02.03.2026 20:40 πŸ‘ 320 πŸ” 79 πŸ’¬ 14 πŸ“Œ 5

Macron has to undo 60 years of French nuclear doctrine based on the premise that extended deterrence is an illusion and convince allies that French nuclear threats on their behalf are credible. Good luck.

02.03.2026 17:23 πŸ‘ 6 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0