I think that Zelensky will restore relations for the good of his country. He may apologize although he has nothing to apologize for.

If there is another meeting they should leave JD at home or put some duct tape over his mouth, his words set off Trump and should never have been spoken. A Vice President berating a President of another nation is unacceptable and because he had not said thank you at that point, during that particular meeting. Trump's loyal Republicans are probably expected to thank Trump for something every day.