The ANA is the most powerful Afghan force in Afghanistan. We're just holding them back from the traditional Afghan way of war. Once we leave, they will be unleashed.
The Chinese have no love lost for the Taliban. They've suffered at the hands of the Taliban when they trained Xinjiang rebels.
Russia and Iran are also two other players in Afghanistan. Both were busy with their own internal problems when the Taliban came to power. That is no longer the case.
The Taliban hates all three with equal passion.