So attacking ISIS’s capital would be illegitimate? Shows you what side the regime is REALLY on.
Maybe they’re afraid that we’ll discover their chemical weapons, and where they came from. How much mythology would that destroy?
I think he's hoping for both an attack and a handover of reclaimed Raqqa to Assad's government, rather than to another faction favored by Turkey, the US, or the Kurds.
So, he's jumping one step ahead more than hoping ISIS can hold Raqqa, as its fall is a foregone conclusion now.