I'm not at all surprised that any politician in any country invests in Bitcoin, they consider themselves smarter than most people, and who wants to miss the opportunity to make money, especially in a country where aren't many real opportunities.
North Korea and other nations with financial sanctions can run their bitcoin mining rigs. They will do it in secret but they don't lose anything when mining bitcoin. No data or article is available about this tactic but I think some are applying it.
In any case, this Ukrainian minister has a demanding job to try to find evidence of any illegal activities if he thinks they exist. Otherwise, he must accept that people are simply smart investors, which of course is not prohibited by law.
As in my nation, governments, police, banks and laws don't protect locals if they have crypto exchanges and get scammed; or they have trades with people (trade partners) have capital from money laundering.
If they are bitcoin sellers: they will lose their bitcoin to scammers and have to return fiat to police or governments. They only protect people who have fiat stolen by scammers.
I think governments (police) will take over the amount of bitcoin after they arrest scammers. Even they get bitcoin from scammers, they don't give the bitcoin to bitcoin sellers. Take it for themselves. Who knows? It can happen in any nation.