His best outcome was peace with security guarantees (not on offer from the White House—who knows what might have happened if anyone else had been invited to these patently absurd two-party talks, to maybe sweeten the deal for Ukraine? Christ, how ridiculous).
Failing that, this is a pretty good outcome, in the scheme of things. He outed Trump as a committed Russian ally, not behind closed doors, but on international television so nobody (who matters in this context, I mean world leaders, not Trump voters) can ignore it. He may have just kicked over the final leg holding up the American-centered security apparatus, in such a shocking and spectacular fashion that others will be compelled to form a new one without us, which is something they absolutely need if they're going to keep fighting and the US is withdrawing support. They need other countries not to follow America's lead.
Yeah it might actually get Europe to take matters into their own hands (which Trump would see as a win for the US but which is long term very much a loss for the US). It also might push the EU more towards China. In fact if I were China right now I’d start making overtures to Europe.
Failing that, this is a pretty good outcome, in the scheme of things. He outed Trump as a committed Russian ally, not behind closed doors, but on international television so nobody (who matters in this context, I mean world leaders, not Trump voters) can ignore it. He may have just kicked over the final leg holding up the American-centered security apparatus, in such a shocking and spectacular fashion that others will be compelled to form a new one without us, which is something they absolutely need if they're going to keep fighting and the US is withdrawing support. They need other countries not to follow America's lead.