Tom Friedman, writing in the NY Times, I think has it right when he argues that the US ought to be more circumspect when speaking publicly about the war in Ukraine.  An excerpt:

“Our goal began simple and should stay simple: Help Ukrainians fight as long as they have the will and help them negotiate when they feel the time is right — so they can restore their sovereignty and we can reaffirm the principle that no country can just devour the country next door. Freelance beyond that and we invite trouble.”