The tricky subject matter involved in hostile warfare is the type of false leadership the aggressor intends to setup to occupy for the time afterwards.
It’s not necessarily true that Adolf Hitler intended to rule over Europe himself. It may have been that he wanted others to govern in his place, and there is evidence to suggest he had been forming a formidable regime to take over once he had declared victory.
The lack of a final day to his effort and the declaration of victory in Europe and further afield killed off such a plan.
This is the grey area of war and it takes up the study of many intelligent planners who need to be aware about the realities of victory and defeat in real time in the modern world.
It can sometimes be confusing because some warmongers have not necessarily taken control once they’ve achieved a sort of victory.
In the case of Russia it’s not been proved who may take Putin’s place if it took Ukraine. In fact, his plan may be to just influence while he lets the country reshape itself.
To understand the field of play in Europe takes expertise, and even historic battles are not yet fully resolved in their complexities because what people actually wanted to achieve isn’t clear.