Personally, I believe the reason that we've seen Zelensky pushing so hard for the war to continue and apparently using more cocoaine than usual is because his time is almost up.
If he doesn't leave the Oval Office with financial support from Trump, he is no longer useful to the deep state rats. And he knows it. He'll likely be dead in less than a year.
Think he had no intention of signing the deal. If he did in fact sign a 100 year deal with UK for same minerals before Trump took office, he had no choice but to queer the deal. Ukraine better get rid of him quick before he takes the country down further.