Based on the pieces left on the chess board, yes, that would be the smartest play. BUT...
Based on the situation as it stands, and as we should expect from Israel and its lap dog (the United States), I don't think they'll be satisfied with anything LESS than regime change. Which means that the Iranian regime is backed into a corner, and Bobby's option listed above (the most rational one) is off the table.
The Iranian regime faces an existential challenge, period. A cornered dog will bite. Really, it's the only option the dog has. That's why a SMART play is to always leave your opponent a way out. We (Israel and it's 100% controlled proxy) have no intention of doing that.
I'm not saying it's a WINNING play for the Iranian regime. I'm saying it's likely their ONLY play, based on my admittedly non-expert view of the dynamic. Other expert-types share that view, though (see the piece in Foreign Affairs).
Yes, it is, but, to temper that a bit....it's also textbook Medvedev. He is the world's designated nuclear saber-rattler. Seriously, he's mentioned using nukes five thousand eleventy times re the Ukraine war, for example. No, I don't think that any country is ready to "directly supply Iran with their own nuclear warheads," because doing so means taking full ownership of how Iran eventually uses that warhead. A nuke that says "made in Pakistan" goes off in Tel Aviv, Israel 100% launches a reprisal strike against 1) Iran and 2) Pakistan.
Pakistan knows that, and isn't going to stick its neck out on this.
Russia knows that, and while it might otherwise stick out its neck, it has bigger problems right now.
China isn't going to allow itself to get roped into Iran's dumbfuckery.
Neither is North Korea, for all of L'il Kim's idiocy, turning over his fate to the whim of mullahs isn't something he'll do.
And, we're pretty much out of any reasonably likely suppliers. So, this is just Dimitri being Dimitri, and mostly, him giving Tucker Carlson talking points directly from their mutual boss.
You and I attend the same denomination. The people of Iran, along with the people of Israel, Gaza, Ukraine, and Russia all got specific prayer mentions this morning. Because, you know....human beings, children of God, all that Jesus-y stuff.