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They'll have to fight their way through Finland which has a history of not working out for them.

Finland and (Soviet) Russia fought two wars and Finland lost territory in both.

And in both cases, Soviet Russia took less of Finland than they wanted to, because the losses were unacceptable to continue.

Norway and Russia do share a border (albeit a small remote one).

Before they could, theoretically, just roll past, but now Finland will be compelled to join due to Article 5.

Not that they'd need much compelling.