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Shashank Joshi Profile picture
@shashj
Sep 15, 2020 • 4 tweets • 2 min read • Read on X
Britain is nearing the end of an "integrated review" of its defence (and foreign, security & aid) policy. Its contours are looking clearer: focus on a wider range of threats, including in "greyzone", and shift from "mass" to "speed & readiness". My piece:
economist.com/britain/2020/0…
'Though Russia is ranked as the biggest military threat to Europe, China is looming as a problem. “China poses the greatest threat to world order,” says General Hockenhull, “seeking to impose Chinese standards and norms and using its economic power to influence and subvert.”...'
'...In place of “mass and mobilisation”, said [UK defence minister @BWallaceMP], “this future force will be about speed, readiness and resilience, operating much more in the newest domains of space, cyber and sub-sea” ...' economist.com/britain/2020/0…
"the emphasis on greyzone threats ... is fraught with risk ... @blagden_david ... points out that Russia’s invasion of Ukraine, which is often held up as a canonical example of greyzone war, involved several armoured divisions and veiled nuclear threats" economist.com/britain/2020/0…

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More from @shashj

Shashank Joshi Profile picture
Jun 24
Important. "The US military strikes on three of Iran’s nuclear facilities last weekend did not destroy the core components of the country’s nuclear program and likely only set it back by months, according to an early US [DIA] intelligence assessment" edition.cnn.com/2025/06/24/pol…
Wow. 'Two of the people familiar w/ the assessment said Iran’s stockpile of enriched uranium was not destroyed. One of the people said the centrifuges are largely “intact.” “...the (DIA) assessment is that the US set them back maybe a few months, tops”...' edition.cnn.com/2025/06/24/pol…
And a caveat. "It is still early for the US to have a comprehensive picture of the impact of the strikes, and none of the sources described how the DIA assessment compares to the view of other agencies in the intelligence community." edition.cnn.com/2025/06/24/pol…
Read 4 tweets
Shashank Joshi Profile picture
Jun 22
Pentagon briefing: “I know that battle damage is of great interest. Final battle damage will take some time, but initial battle damage assessments indicate that all three sites sustained extremely severe damage and destruction.”
Pentagon briefing: “In total, US forces employed approximately 75 precision guided weapons during this operation. This included, as the President stated last night, 14 30,000 pound GBU-57 Massive Ordnance penetrators, marking the first ever operational use of this weapon.”
Pentagon briefing: “our initial assessment… is that all of our precision munitions struck where we wanted them to strike and had the desired effect, which means especially in Fordo, which was the primary target here, we believe we achieved destruction of capabilities there”
Read 10 tweets
Shashank Joshi Profile picture
Jun 20
1. Useful details here. “While some American officials find the Israeli estimate credible, others emphasized that the U.S. intelligence assessment remained unchanged” nytimes.com/2025/06/19/us/…
2. “American spy agencies believe that it could take several months, and up to a year, for Iran to make a weapon.” nytimes.com/2025/06/19/us/…
3. “new [White House] assessments echoed material provided by Mossad, Israel’s intelligence agency, which believes that Iran can achieve a nuclear weapon in 15 days.”

But: “None of the new assessments on the timeline to get a bomb are based on newly collected intelligence”
Read 5 tweets
Shashank Joshi Profile picture
Jun 12
'To reach even [Natanz] all the weapons available to the Israeli Air Force, and all except the 30,000 lbs GBU-57/B and the 5,000 lbs GBU 72/B available to the United States, would likely require several impacts into the same crater to ‘burrow’ down...' rusi.org/explore-our-re…
"For the FFEP [Fordow] and new facility at Natanz at an estimated 80-100 meters, possibly with layers of reinforced concrete, even the GBU-57/B [carried by B2/B21] would likely require multiple impacts at the same aiming point to have a good chance of penetrating the facility."
"Strikes with lesser penetrating weapons could still collapse entry and exit tunnels...However, unless a longer-term campaign were mounted with regular follow-up strikes, efforts to dig down...to re-establish access and supplies would likely begin almost immediately."
Read 16 tweets
Shashank Joshi Profile picture
Jun 3
🧵A few other random observations from the Strategic Defence Review that caught my eye.
"much more rapid progress is needed in [carrier strike] evolution into ‘hybrid’ carrier airwings, whereby crewed combat aircraft (F-35B) are complemented by autonomous collaborative platforms in the air, and expendable, single-use drones" Image
Pretty interesting, but v non-committal.

"Exploring possible development from a Type 45 destroyer to a minimally crewed or autonomous air dominance system that could integrate directed energy weapons" Image
Read 47 tweets
Shashank Joshi Profile picture
Jun 1
1/ Very important signal that UK might return to air-launched tactical nuclear forces by buying F-35A and participating in US nuclear sharing arrangements. There had been indications that UK was preparing to be able to host B61 tactical nuclear weapons. thetimes.com/uk/defence/art…
2/ UK participation in nuclear sharing would have limited impact in itself, since weapons remain under US custody & control, and several other European countries already host B61s & practice delivering them. This doesn’t mitigate against withdrawal of US nuclear umbrella. But …
3/ Having the Royal Air Force prepare for & be capable of handling, carrying, delivering & planning non-strategic nuclear use could make it easier in the long term to develop a (vastly more expensive & currently unviable) sovereign air-launched tactical nuclear leg, like France.
Read 6 tweets

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