People don't talk about it much but Al-Assad is now aligned with Arab nations (reaching out to the GCC as well, KSA and UAE in particular) and he pretty much won the internal war between Syrian Arab nationalists aligned to the Al-Assad regime and the Pro-Mullah Wilayat al-Faqih lot. Russia was obviously on the Al-Assad side while Iran was supporting the Shia faction ("religious one"). With their main allies being Hezbollah and Iraqi Shia militias led by the now dead Al-Muhandis etc.
Houthis are also distancing themselves from the Mullah's. There never was much of a close relationship (other than political and some military smuggling initially from September 2014 to March 2015 and later on smuggling networks across the Arabia Sea) but they too know where this is all going. Too large of a distance, very few if any similarities (Zaydi's are totally different to Wilayat al-Faqih), KSA next door, people to people relations and the fact that Yemen has always and will always rely on KSA. They (Houthis and the elite) cannot afford a perpetual war against KSA so they are reaching out as well with negotiations ongoing under conditions of them completely cutting off ties to the Mullah's.
But this is all the desperate actions of a sanctioned regime who is using gullible Arab warlords to contain the fire outside of their own borders but little do they know. They still have nightmares about the Iraq-Iran war hence the proxy obsession.
Keep in mind that is was bombs of your beloved americans that completely destroyed Mosul, Raqqah, Fallujah etc, all cities with majority Sunni population. And it is bombs of your beloved Americans that continue to rain above sunni-majority countries like Somalia and Afghanistan. But i guess you dont have problem with them