The roads have to have been improved since the Germans went there.
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Roads - maybe. mud no.
I seen videos of Russians tankers on exercises and getting stuck in the mud - it is a big problem - one tank had to be towed out by two others before it sank out of sight. Its that bad. They have to stick to the roads this time of year.
If their tires are as cheap as some say, then they have real problems.
I would say mud, yes. In Kiev proper the roads were fine but outside the city there were plenty of dirt and gravel roads
(I was there in 2016 and 2017)