CNN does a good article about Russian logistical failures in Ukraine and how that has been a large factor in their poor performance. The article is decorated with photos of "dead" Russian trucks with their hoods up, the very picture of broken-down transport.
CNN attributes Russia's problems to two things: conscription and corruption. I agree with both, but would add a third they don't mention. The other DrC and I have traveled in Russia on several occasions and we always were struck by how shabby and down-at-the-heels everything looks.
We concluded that maintenance was simply not in the Russian DNA, was not something to which they devoted much energy. They build a nice looking building and then never touch up the paint, shine the brass, or sweep the stairs.
If the Russian military operates the same way civilian Russians do, their trucks aren't maintained, filters aren't replaced, oil isn't changed, brakes aren't repaired, batteries and hoses aren't replaced. Then, when you need the trucks to step up and deliver munitions and supplies to the front, they fail.
A modern army is no better than its trucks, no better than its maintenance, no better in short than its logistics. Evidence suggests Russian logistics are deficient.