The conspiracy theory about "Neutral Finland" is outright bizzare. It may have passed as wartime propaganda, but with all of today's information, to cling to it is absurd. Going no further than wikipedia:
And so on and so on. Finland was fully commited and coordinating with the Germans on the invasion from late May 1941 to get a slice of the cake, just like all other axis minors. One can discuss whether they felt they were in the right to do this, or whether this was wise. But denying it with some flimsy "neutral" exacuses is just silly.
So Finland was fully commited to going to warOn 20 May 1941, the Germans invited some Finnish officers to discuss the coordination of Operation Barbarossa. The participants met on 25–28 May in Salzburg and Berlin, and continued their meeting in Helsinki from 3 to 6 June. They agreed upon the arrival of German troops, Finnish mobilization, and a general division of operations.[45] They also agreed that the Finnish Army would start mobilization on 15 June,
So, German ships and planes actively using Finnish terriotry to conduct military operatons.German minelayers hiding in the Archipelago Sea laid two large minefields across the Gulf of Finland in the late hours of 21 June.[48][49] Later the same night, German bombers flew along the Gulf of Finland to Leningrad and mined the harbour and the river Neva. On the return trip, these bombers landed for refueling in Utti.
The arrest of the consulate alone was a clear indication of Finland just waing to a pretext to "formally" declare war.In the early hours of 22 June, Finnish forces launched Operation Kilpapurjehdus, which aimed to deploy troops to the demilitarized Åland Islands. An international treaty on the status of the islands called for Finland to defend them in case of the threat of an attack.[50] However, the operation was coordinated with the German invasion, and the personnel of the Soviet consulate there were arrested. According to Finnish historian Mauno Jokipii, Finland knew that it had violated international protocol.[51]
On 21 June, Finnish units began to concentrate at the Finnish-Soviet border, where they were arranged into defensive formations. Finland mobilized 16 infantry divisions, one cavalry brigade, and two jäger brigades
Two German mountain divisions were stationed at Petsamo and two infantry divisions at Salla. On the morning of 22 June, the German Mountain Corps Norway began its advance from northern Norway to Petsamo. Finland did not allow direct German attacks from its soil into the Soviet Union. On the same day, another German infantry division was moved from Oslo to face Ladoga Karelia.
And so on and so on. Finland was fully commited and coordinating with the Germans on the invasion from late May 1941 to get a slice of the cake, just like all other axis minors. One can discuss whether they felt they were in the right to do this, or whether this was wise. But denying it with some flimsy "neutral" exacuses is just silly.