No, but when a regime has the guts they can put the oligarch in jail and confiscate their property. Of course, this is a rare occurrence, having happened in Russia when some oligarch was not in compliance to the government.
But, if it has been done before it can be done again? Even in crazy Ukraine they managed to overturn one shady deal of one oligarch, after that orange revolution, but again, it was a matter of a guy who the regime did not like.
So, if it has been done before it surely can be done again. The only question is do the authorities have the balls to do so? Almost everyone with BIG money in eastern europe has come to that money through illegal activities in the transition from so called socialism... there is potential for a lot of stuff to be recouped there, including the saving of Slovan from this equivalent of an absentee landlord.