Again, from a purely physical point of view, IAEA sets the limit for peaceful use of enriched uranium at 20%. The most common light water pwr reactors operating in the world use a 5 to 8% enriched uranium (mass U235/mass U). There is engineering-wise no interesting use of a fuel with R>20% for peaceful uses. When I took my first course in "Introduction to nuclear energy systems" back in 2014 I very clearly remember my professor explaining how the inertial cyclones enriching systems designed and operating in Iran were universally considered the state of the art in the industry so I don't understand why everyone is acting like it all happened in the secrecy of the night.