I dislike both the Regime & the Rebels!!
Ok, I agree, but isn't this a simple matter of SOVEREIGNTY?
Imagine a purely hypothetical scenario where some anti-government-protester-rebels started causing a ruckus in THE UK, like, I don't know, maybe sorta like THE IRISH REPUBLICAN ARMY.
Now imagine that foreign governments (like Russia and Saudi Arabia) started providing weapons and funding to THE IRISH REPUBLICAN ARMY.
Don't you think that would be a violation of THE UK's SOVEREIGNTY?
Foreign governments should never interfere in the affairs of a SOVEREIGN NATION unless they are EXPLICITLY INVITED.
Even vampires have the common courtesy to wait until they are invited before entering into someone else's home.