Trump signed a deal with the Taleban in February 2020. It involved a timeline. Biden simply inherited it when he became President.
Discussion
And dropped the ball hard
No one forced Biden to go along with anything.
None of this is the original point.
The US involvement has projected weakness, has been ineffective, expensive, and shouldn't scare China at all without direct involvement.
It's a joke to fund corruption. It's fiat bull shit.