Putin has broken 17 ceasefire agreements with Ukraine since 2014.
The idea that suddenly he'll stop seems rather fanciful.
He'll push for elections, 'meddle' get his stooge in and Ukraine will become part of Russia.
From there it's a hop, skip and a jump to Moldova and Lithuania. Before you know it he's nudging NATO countries - a drone here or there - to see whether Art 5 still works.
I don't have the answers but the problem of Putin isn't going to vanish. And any successor he might have waiting isn't going to be any less aggressive.