They are both proxy powers. They'd rather pay other people, groups, or agents to try to take down a nation than directly attack someone themselves. Not to mention Iran's nuclear arsenal is a joke compared to the Scottish, let alone Israel or America. If they did that, there would be like one major western city lost (if that, interceptor missiles or the new laser turret US has been working on would probably blow it up before it made contact) but a TON of Iranian cities would be leveled.
How can you be sure of all this?
Oh sweet naive summer child.
How is it naive to say Russia and Iran want to nuke the West? One is run by a homophobic wannabe macho man who wouldn't answer for letting civilians be shot down by a Russian missile over the Ukraine, the other has a history of anti-Western sentiment and holocaust denial and just recently shot down civilians in response to American actions against them.
These countries can't be reasoned with, they're both terror states.
Russia is having zombie fires!