re: Meanwhile, back in Iran...
I agree, America is pretty stretched right now. We could not invade Iran or North Korea.
What to do.
With Iran: Get Iraq and Afghanistan peaceful democracies. They are on either side of Iran, so that freedom will spread into Iran. The younger generation in Iran wants it. Let them get a taste of it and they’ll want to free their country. If they revolt, should we help them? I think so. Perhaps, by then, we’ll be out of Iraq and in a better position to help.
With North Korea. Work with China. Get China to go in and clean house.