Unlike, India, Pakistan or, say, Israel, Iran is a ratifier of the non-proliferation treaty and subject to inspections making sure they don’t. Meanwhile Israel not only has had nukes for decades but also continually refuses any accountability for them.

Indeed, to venture off-topic, Israel has sought nuclear weapons for as long as it has existed, which one might plausibly construe as further evidence that their state was knowingly and willingly established by military force, without much pretense that it could ever persist otherwise.