Being a border nation with Russia now, without a staunch pro-Russian government, is pretty scary right now. Even if you are a NATO member, because I don't trust NATO to go to war with Russia.
Why do you think Russia would attack NATO member? War has its own costs, Russia probably has some calculation. I don't think we will see any combat from Russian sides, at least on NATO member.
At least Finland doesn't, to my knowledge, have a meaningful amount of Russian population to "liberate". Compared to countries that used to be soviet republics, I'd say they are relatively safe.