From: Republic of Cascadia
I feel like we're missing the elephant in the room: Sweden is connected to both the Atlantic Ocean at Gothenberg and the Russian rail network at Haparanda and hex 192, 19. The nearest Russian port to the West, Petsamo, is around 3 turns away from the UK and 4 from France, but Gothenberg can be reached within one. Another turn from one of these locations and you can suddenly be in Tabriz preparing to surround Iraq or shouldering some of the burden in Poland. In essence, the Allies would be able to distribute their forces more efficiently, propping up Russia when you least expect.
An Allied Sweden also opens up Norway to assault, further securing Allied reinforcement lines to Russia. Three corps and an HQ are enough, as the first two can cut off the whole Norwegian rail network off and, with it, the hope for reinforcements. The defending side is stuck with just a detachment and an HQ of its own, which is just sad.
Not to mention, invading Sweden is logistically difficult for the Central Powers. Scania is fine, especially if Denmark is taken first, but then it's quite a few hexes to any city north of there. And the CP would have at most strength 5 resources while Sweden's are strength 8. And while you are conquering the British are getting 60 MPPs or so from Sweden.
In other words, invading Sweden as the CP is a surprisingly bad idea. Better invade Switzerland or Bulgaria as the Entente, at least you will accomplish something without helping your enemy. Also, I could confirm that there is no Operation Fork in this game, so go invade Denmark as the CP as well.
Yeah, this is true in WiE , if the Axis takes Leningrad...then all of Axis held Scandinavia (or at least towns on the RR net), are linked with the rest of Axis held Europe.
Your right...Sweden would be disastrous for the Central Powers if they went Entente and Sweden couldn't be defeated quickly. Of course, the Entente might be surprised and not have anything available to scrap together to help them in time. So...who's knows?
As for Denmark, I was only half serious, or half not.