

I would think that credible evidence of foreign agent activity can be prosecuted without infringing on the independence of the institution.
Of course it is possible that an institution is beyond reproach, but i would find that unlikely for institutions just a decade old and probably started with anti-russian loyalists as the corruption to clear out back then was pro Russia focused corruption.
So i think of this to be concerning as they probably uncovered some actual corruption of Zelensky or people close to Zelensky.
You dont need an ICC warrant to arrest people suspected of war crimes. States have an obligation to investigate such crimes even without the ICC involved, when they have reason to believe someone inside their jurisdiction has committed such crimes. This is not limited to their own citizens but anyone inside their jurisdiction.
Ironically the concept of universal jurisdiction also is a result of Israel abducting Adolf Eichmann in Argentinia and bringing him to Jerusalem for prosecuting his crimes as one of the key SS figures behind the Holocaust.