And the assurances they gave to China, Russia, and Iran are that they promise to be a terrorist state against the US?
No. They include the ban on Al Quaida, East Turkestan Islamic Movement and IS.
The Russians and the Chinese have told the Taliban if they don't then their Emirate is over. The Chinese and Russians have already troops at the border. And after the example of Syria where a few thousand Russian soldiers with a few dozen airplaines and other kind of equipment destroyed the terrorists there the Taliban know this is serious.
On the other hand R&C have offered the Taliban acknowledgement, development and integration if they behave.
The Taliban have accepted. Google it.
Btw this is how diplomacy works and not like the Demonrats. First they scrap Trumps contract with them, replace it then by nothing and later look from Camp David how everything descends into Saigon 2.0. Later they blame the whole world for their failure.