Not quite so neutral
During World War II, Sweden was unable to stay away from the military conflict, as it had hoped to. Under pressure from the Third Reich, it had to agree to the transit of German troops through its territory.
Furthermore, Stockholm deviated from its policy of neutrality not only under pressure, but also quite voluntarily. During the Soviet-Finnish war, Sweden declared itself a so-called “non-belligerent” state. However, without directly intervening in the conflict, it nevertheless actively supplied Finland with weapons, ammunition and volunteers.
In addition, the Swedes ended up taking part in the hostilities, too. From time to time, the warring sides’ submarines attacked and sank Swedish merchant ships by mistake, while aircraft that had lost their bearings launched air strikes on Swedish territory.