Vance made it very clear to the rest of the GOP that Zelensky is an “enemy” now. He misleadingly accused Zelensky of “campaigning with the opposition” because he met with Harris before the election. (He met with Trump too)
That statement was a direct signal to the party to turn on Zelensky and to make him an object of partisan divide, and Lindsay Graham understood that crystal clearly and called for Zelensky to resign shortly after the meeting, not long after praising him.
After sleeping on it, it’s obvious now that this was all to redirect the blame for Trump’s failure to meet his promise to broker peace swiftly.