Or you can just stay out of Syria
Unfortunately, that won’t work. Syria was more than willing to be Iran’s proxy, was very active in supporting the anti-Iraq forces and Hezbollah. And the Russians were more than willing to give their tyrannical little buddy any weapons he wanted.
Unless pencil-neck is overthrown, he will keep butchering his own people until they finally surrender, and then he will go right back to trying to foment war as he did before. And those chemical warheads will still be there, for him to use any time he wants to.
No need to mention, I suppose, the Norks trying to help him develop either nuclear weapons, or essential parts for them for the Iranians.