It doesn't work like that. They are their own people, not puppets as you try to imply. And it's not like oligarchs even have that much power to make someone into a puppet, they are not FSB.

i think that political regime in Ukraine is purely oligarch-based. Ukraine does not have strong traditional government institutions, instead the government is driven by current oligarch configuration. it used to be Yanukovich, then Poroh, now it is Benya (via his proxy Ze). just look at Groysman, the prime minister, as they say in Russian, he "changed his shoes while walking" and switched his allegiance from Poroh to Ze/Benya in no time. government in Ukraine is weak and servile. they have stronger civil society, but it shows in short outbursts, then oligarchs take over again.