I read the transcript. It is hard to conceive that Zelensky has won this debate despite being surrounded by two opponents. Supposedly well-rehearsed opponents, but it became apparent that they're not experienced. They're just spoiled by obtaining everything too easily.

Yes, he lost US government support, but this is regardless of what he did. He was losing it anyway. But Trump and Vance failed to justify why they ambushed him like this.
https://apnews.com/article/trump-zelenskyy-vance-transcript-oval-office-80685f5727628c64065da81525f8f0cf