This has nothing to do with Iran and all to do with Russia.
Ever since Trump threatened to invade Greenland, that the EU started to view the USA as a unreliable ally. Something that didn't happen for over a century.
Because of this European countries are starting to consider that if Russia attacks, that the USA will no longer cover Europe with it's nuclear umbrella.
So for several months, it was speculated that France and the UK would expand their nuclear umbrella to include the rest of Europe.
In a lot of ways, this is to avoid having more countries developing their own nuclear program. A good example of this would be Poland, which is right next to Byelorussia and a prime target for invasion by Russia, once again.
Avoiding nuclear proliferation is an important point to avoid a nuclear war, as it reduces the amount of fail points.
This is something that the USA did for more than half a century, to good success, by offering it's nuclear protection to it's allied countries.
With the USA now being viewed as an unreliable partner by most countries, you can be sure that there are more nations considering getting their on nukes.
Some more examples include Japan and South Korea. Which are right next to 2 aggressive countries with nukes, North Korea and China.
Ukraine is also very likely considering starting a nuclear program to get some insurance against the next Russian invasion.
Ukraine, Poland, Finland are able to get assurances from a nuclear umbrella from France and the UK. But Japan and South Korea do not have a nearby ally with nukes, that could do the same assurance.
Even a country like Germany, could start considering restating it's own nuclear weapons program.