The West appears willing to let Ukraine go. They don't like it, but having gotten themselves exhausted by recent wars (especially the US), they seem to be willing to consider it not-their-problem.
But Finland and Sweden are decidedly aligned with the West, and not only would they not tolerate threats to them, but that re-casts what the situation in Ukraine means. The West might be willing to choke down what could be seen as appeasement, but they need to be able to believe that it's not going to be immediately followed by more. If they're going to be forced to fight, they'd rather do it earlier rather than later.
It's entirely possible that I'm wrong; I'm far from an expert and even the experts seem unclear. But this statement strikes me as extremely dangerous, even in an already tense situation.