If Russia even touches Sweden, it will be instant war because there are no brown skinned natives and no one speaks Russian (historically European, not Russian, not middle east). Russia knows this so it's very likely that this is propaganda designed to place Russia on the world stage as an enemy to everyone. Again.
If Sweden were invaded by Russia, would the politicians refuse to surrender and instead join a guerilla resistance? Politicians love to make others sacrifice instead of themselves, and I'd wager the propaganda here is just cheap talk that will never be tested.