BIDEN does not have to honor any agreements signed by the Trump administration.
If the United States had kept the NATO force in Afghanistan that was there in January, none of this would of happened and Afghanistan would be experiencing a month like August 2020 in August 2021.
TALIBAN only held 77 districts on April 13, 2021, about the same as they held on November 28, 2017 nearly 4 years earlier. Afghanistan has a total of 421 districts. Its only after Biden's non-conditions based withdrawal, that the Taliban effectively take most of the rest of the districts and 33 of 34 provincial capitals in four months.
Had BIDEN kept the troops in Afghanistan, the TALIBAN would still be isolated to the rural districts and have less than 20% of the country under the control. WE KNOW THIS BECAUSE THAT IS THE HISTORICAL RECORD FROM THE YEARS 2015, 2016, 2017, 2018, 2019, and 2020!