You are talking like there’s huge armies of resistance facing Wagner.
There are none; they’re all in Ukraine.
Patton had to contend with real Wehrmacht and SS forces with battle hardened troops trying to stop him.
All such Russian troops are in Ukraine, and not in the way. What soldiers are there between Moscow and Wagner that are capable to stop them?
And many, if not most of them, are fed up with the oligarchs in Moscow stealing the money for weapons and ammo.
I would say it really sucks to be Shoigu. He will flee soon, if he hasn’t already.
Plus the Wagner group is probably the most effective and well equipment fighting group among the Russian Forces, mainly because they were supposed to be personally loyal to Putin, and they are battle hardened by being the main fighting group in Bakhmut.
That plus Russia having sent most of their able fighters to the Ukrainian fronts means the roost is mostly empty. It’s not that surprising at all that the forces which remain in Russia are unable to effectively stop their advance.
Are they in Moscow yet? lol