Regarding #3, I haven't kept up with this specific issue lately, but wasn't the issue with their use and creation of HEU, atleast for a while, that they wouldn't allow UN nuclear energy inspectors to monitor what was being created at the reactors? There are AP articles from 2023[1] saying that Iran had barred 1/3 of the most experienced inspectors the UN had there from monitoring it, and a news article from the UN itself from this year[2] says that Iran has been actively impeding their ability to monitor its nuclear program.

[1]: https://apnews.com/article/iran-nuclear-un-inspectors-b82c92... [2]: https://news.un.org/en/story/2025/06/1164291