Tibs, this is just silly partisanship, and I've told you a few times. Our embassy is fully up and running, and Stephanie Hallett, a very experienced diplomat, is the current Chargé d'Affaires. If you want to read her bio, see here:
https://il.usembassy.gov/our-relationship/dcm/
As for what Biden can do, the War Powers Act theoretically limits his options, but most presidents since it's inception have found ways to easily work around it. Learn more about it below.
https://www.nixonlibrary.gov/news/war-powers-resolution-1973#:~:text=The Constitution divides war powers,chief of the armed forces.
https://www.history.com/topics/vietnam-war/war-powers-act#section_4