No - Putin believes he can win, this is to scare NATO.

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.