In a real sense all nukes are strategic. No country, except the US, with nukes has ever used them or been attacked.

Iran, if it is building nukes, has a very real need for them. They are under attack by the US and Israel, both nations with WMDs. If nothing else they need nukes simply to prevent folks from messing with them. (However, I believe they have essentially the same capacity if they chose to make dirty bombs. They could devastate Tel Aviv, for instance.)

What made Cuba so dangerous was that the Russian troops has tactical nuclear weapons under local control and the US didn't know that. Imagine if the US invaded. The Russian commander would have had to use nukes, the US would have had to respond, and so on.

I realize there are low-yield nukes designed for local use which are considered tactical weapons and I think that their existence has strategic considerations.