Conscription for basic infantry training is mandatory in Russia currently. They've shortened the length of the course, but it's still a thing.
Older generation (those recruited at 50+ currently) would've had 2 years duty in the army as conscripts.
I'm talking about the constitution and quality of the training they receive. As an outsider, the Russians currently appear to lack a real deficiency in fighting ability.
This, I suspect, comes back to training. They may be shown how to fire a weapon or throw a grenade, but what standard is their firearms training?
Are they training to work effectively as a fire team and a section? Does this fit into wider training at platoon/troop level? What about effective drill and fieldcraft?
In combat, it all boils back to the training - it's drilled into you what to do, where to do it and when. Teamwork is the underpinning element to it all.
Like I said, it doesn't appear that the Russians have much of the above even if they do receive some training, whereas the Ukrainians look to have combat skills.
It's well known that Britain's combat infantry course is well respected around the world, so if they're receiving a fraction of this then it's going to help, a lot!
For reference, it's an intial 26 weeks in the UK, and then it continues and improved further when you reach your regiment.