It doesn't seem like there have been major advances by the Russian Army on the Kharkiv front since the launch of this new offensive. But all the small towns in the Donetsk region that weren't already under occupation are being smashed to nothing by artillery. While the Ukrainian Army is conducting a lot of very impressive strikes against planes, command posts and tanks, I won't be able to believe in them actually "winning" unless they can recapture significant cities (like Kherson) but that seems wildly optimistic right now. I don't think there's any serious possibility of Russia losing the land corridor region, the way things are going. But likewise, a Russian push for Odesa and Transnistria seems wild, though probably more believable than Ukraine retaking Kherson.
Zelensky is entirely dependent on the continuing flow of Western arms in order to continue. The other former Eastern bloc countries are clearly the most motivated... But I can't see any of them taking any truly radical action (eg. Leaving Nato in order to get in stuck properly).
I think behind closed doors the Western leaders are already strategizing on how they'll spin a Russian victory and reintegration of Russia into world economy "to keep food prices down"