I don’t think Iran is hiding the fact they are building nuclear weapon tech and long range ballistic missiles capable of MIRV.

People dismissed North Korea’s ability to do so for a long time. They thought they were too poor and isolated.

None of which is true of course. Not even the North Korea claim. NK applied to leave the NPT immediately after they deemed the US untrustworthy in 2003, The only country to ever withdraw from the NPT. I would hardly call that hidden.

https://www.armscontrol.org/act/2003-01/news/north-korea-qui...