The same way anyone starts negotiating with anyone: open a dialogue and exchange demands, and then work to make concessions and compromises. They won’t do that, though, because then the infinite money spigot from the US will shut off because America doesn’t want this war to ever end.

You tell me where you live, I'll break into your house and steal half your stuff.

Instead of fighting back or calling the police, we can negotiate so I can have half your stuff. Sound good?

I dunno, do you have nuclear weapons that could cause the apocalypse?

Countries aren’t people. The scale the work on is much greater.

Oh okay, so if I held enough people hostage I can have your stuff? Good to know...good to know...

Literally yes.