A whole lot of people who were confident that Russia wouldn’t invade Ukraine are now very confident that Russia won’t keep going.
Especially given the fact Putin has de facto switched to war time economy, spending like six percent or more of his GDP on the military, which even much more than the US (compared to GDP). That tells you he's at least preparing for a much longer battle.
The goal is now Europe in particular massively ramping up its defense capabilities so that Russia will think twice whether they attack one of our allies (with a clear commitment that the US keps its troops and nukes here and that nothing is off the table). It's called peace through strength.
