I just recently read that Sweden allied itself with Britain and France in 1855; however, when war against Russia broke out, it did not participate. Suppose there is a change of heart on the Swedish leadership and they join the allied nations in the fight against Russia.
How well would they do? Could they do any kind of offensive, and if so, how far would they get? Could they possibly get Finland back from Russia?
Would this action perhaps prevent the cementation of Sweden as a neutral state? Would Sweden remain neutral to all future conflicts, or would they become more and more belligerent? Maybe they would even participate in the trend of New Colonialism in the 1870s?