They have been fighting each other 8 years they have used even mercenaries from Latin America, Asia, Sudan but to no avail.
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No cap. And they've all pull out, one-by-one. Now, UAE and KSA are the only countries remaining, and they've turned into 'foes' with conflicting interests
I regularly follow the Yemeni conflict, and what amazes me the most is the fact the separatist movement of South Yemen (or South Arabia as they call themselves) is still alive. Heck, the VP of the 'internationally recognized' Yemeni gov't Aidarus al-Zoubaidi is also the president of the separatist STC, lol. At this point, I predict a federation of north/south Yemen.
Iran is also geographically and terrain wise different than Iraq it’s mostly mountainous and America could face another Afghanistan. Russia won’t allow an American controlled country being across from them in the Caspian Sea. These militias are mostly Shia some who even believe that Syria and Iraq should be ruled like Iran by an ayatollah. America’s best option is to arm Sunnis or cause Shia vs Shia conflict or get Israel to nuke Iran.
If the West were to invade Iran (which btw will never happen), Russia won't do jacksh*t outside of maybe continue selling weapons. There're no formal alliance between them besides being united in an anti-West front.
As I said before, the best way to counter Iran is to go after their puppets. Their only Sunni ally are currently being obliterated in Gaza. But Assad, Hezbollah, Houthis and their Iraqi allied militias need to be dealt with, if they want to put Iran in their place.
Unfortunately, we're past the time of trying to get rid of Assad, all attempts thus far have failed; likewise, all attempts at dislodging Houthis have been fruitless and they will be part of a future (permanent) power-sharing of Yemen.
Hezbollah was the biggest faction to not get disarmed after the Lebanese civil war. With their Israeli war, later Syrian war and massive Iranian support, they're now part and parcel of establishment and all future gov'ts of Lebanon. Otherwise, they'll destabilizing the country. Same with total shia control of Iraq.
At this point, the West are running out of options. UAE and KSA have started to normalizing ties with them for lack of better options, something the West and Israel feels at odd with. Additionally, sanctions haven't deterred them much. It will be interesting to see how they decide to address Iran in the future.