The logic I’ve heard is that one of the more palatable defeat conditions for Russia is that they’d rather lose to NATO than Ukraine. So they’re fine to push limits because even the worst case scenario gives them better options.
He's not wrong - this is a war of attrition and Russia is about to raise 500K-1M soldiers - if they can do that, and keep Ukraine on their backs, it's possible Russia could break through.
Unlikely but possible.
Ukraine has difficulty recruiting and equally high desertion rates.
'Eventually something has to give'.
I think it's unlikely and that Ukraine will be able to hold out.
Russia has developed necromancy?