Not that anyone hasn't realized it but it's a difficult situation. If Putin doesn't get something to save face he will keep fighting. That means either we all go to war alongside Ukraine ... likely causing a World War or we find a compromise to stop it. There doesn't appear to be an in between answer.
You're assuming he cares to save face. Putin is a ruthless Dictator in his own Country, and he doesn't have to.
This whole exercise isn't about saving face, it's about using Trump to give him some sense of legitimacy internationally and buy time while he continues his agenda. It's about further delaying any economic consequences of his (current) war.
There's a warrant for his arrest from the ICC for the atrocities he's done - and the USA is one of the nations signed up to enforce that. Trump choosing to ignore this and allowing this meeting to happen on US soil is a huge rebuff. As is the mere thought of the USA and Russia carving up Ukraine in a "peace deal", basically awarding over 20% of the country to the aggressor with zero input from Ukraine. Plus no real guarantee that Putin won't push further in future.