Right now he has trouble getting troops (cannon fodder to some). I thought if he made an actual "war" proclamation that he would be free to draft any and all eligible individuals. Russia has a population of 144 million. Ukraine has a population of around 44 million. Putin has made a phone call to his buddy in Belarus to get his army in gear. Belarus has a population of 9.3 million.
Population resources are 3.5 to 1. He seems to have a huge backlog of military equipment left from the Soviet days. Since old Soviet equipment has been refitted for NATO, it seems as though the Soviet backlog could be renewed for use in the Ukraine conflict.
From what I've seen, however, the vast majority of that reserve military equipment is scrap. Sitting in warehouses and fields, rusting away while their defense contractors abscond with the maintenance funds. They've already thrown the best equipment they have into this fight, up to and including one-off prototype tanks. There is documented evidence they've lost half of their tanks, and the reality is likely substantially higher. Their vaunted elite paratroopers, the VDV, have been shredded in every engagement. The pride of their Black Sea fleet, the Moskva, was sunk, and even it was decades out-of-date. They've already pulled a number of units from the eastern half of the country to backfill for their losses. They have somewhere between 8k and 12k troops just trying to beat out the last of the resistance (1k Ukrainians?) in Mariupol.
Population resources don't mean a whole lot, either. Ukraine has the edge in equipment, training, tactics, discipline, and morale. Perhaps eight years ago their troops were on par with the Russians, but ever since 2014 they've been reforming and training with western government advice. Russia can't just throw a bunch of minimally-trained, undisciplined, under-supplied troops into battle and expect to win, although I wouldn't be surprised if they try. They're already suffering a massive brain drain--many of those with the resources to leave, are leaving. And I've heard anecdotes of young men who are conveniently out of town when the recruiters come knocking.
At the moment, the front is pretty static, with only very marginal gains for either side. And that's *after* Russia withdrew from the north and regrouped in the south and east, and before the heavier weapons and support (tanks, artillery, etc) started arriving from the West. It'll be interesting to see what impact the new arms make.