The GDP doesn't really matter in this conflict, since the Ukraine is essentially getting all its weapons, intelligence and training for free.
That and, a lot of the Russian military (the reserves) and their equipment (ships, subs, intercontinental bombers, nukes, etc) are not really going to help the Russians win the conflict, since they're either not useful, or politically impossible to use.
I think if Putin can sell to the Russian people that this is a war, not a special military operation, and as such, they should call up the reserves, break the law about how those reserves are allowed to be used, etc, then they could probably win. Without that, I don't think it's that realistic: they're fighting against a totally mobilized country that's being flooded with high-tech weapons. Imagine afghanistan, if the taleban were armed for free by the western military-industrial complex. The US wouldn't be able to do it. Russia almost certainly won't be able either.
That and, a lot of the Russian military (the reserves) and their equipment (ships, subs, intercontinental bombers, nukes, etc) are not really going to help the Russians win the conflict, since they're either not useful, or politically impossible to use.
I think if Putin can sell to the Russian people that this is a war, not a special military operation, and as such, they should call up the reserves, break the law about how those reserves are allowed to be used, etc, then they could probably win. Without that, I don't think it's that realistic: they're fighting against a totally mobilized country that's being flooded with high-tech weapons. Imagine afghanistan, if the taleban were armed for free by the western military-industrial complex. The US wouldn't be able to do it. Russia almost certainly won't be able either.