I understand when people see things like this and say "Why won't someone do anything about this?! Why don't they care?", because when I see things like this I also want them to stop, and it can be easy to ignore other factors like how nuclear nations can act with impunity as long as they act first. Obviously there's nothing really more anyone can do past the sanctions that are happening, but the sentiment is understandable so I try to not to judge them so harshly.
Finland and Sweden already have a mutual defense pact so neither would join NATO without the other. I think they both probably will, maybe after Kiev falls or some larger offensive is launched. I think Russia really miscalculated here on just how much the world would care about their invasion, I guess when you spend too much time in Syria you just get the impression that people don't really care about wars all that much anymore. It doesn't really change Russia's security situation though, they never had that much influence in Finland compared to the west and it's not like NATO just needs Finland to finally invade.