This question is obviously going to need some clarification about how much territory Wagner controlled on June 24 2023

@JoshuaWilkes Is it so controversial that you can't just go with what Wikipedia says?

@BenjaminIkuta Sure you can go with that, but you have to tell us! :D

@JoshuaWilkes I think Wagner can be argued to have controlled Rostov, and possibly (though less likely) Voronezh. That's not really much in terms of area.