The RN did send a Submarines squadron into the Baltic through the mined Danish Straits by 1915. Surface ships would be another matter but the Danes wouldn't like to fight the RN. With a bellingerent Sweden in the back things will of course look different but I'd expect Danish and Norwegian PM urging the Swedes not to go to war.
Sweden would at this time still be exporting iron ore from Narvik. The internal railroads wasn't developed at this time as 26 years later so ore could be railed to Umeå for shipping during ice-free times. Some First Sea Lord may get ideas of blocking that at Narvik!
Denmark would continue trading with both sides if possible and may be able to supply substantial agricultural produce to a Sweden in want. If Sweden only DOW Russia Denmark may try limiting such to keep Sweden out of wars way; such action will of course not be possible if Sweden is part of the Central Powers for fear of Germany.
Any British designs on Norway may make the German Navy react - Fall N attack on Norway hadn't been drawn up at the outbreak of war and only been so by late 1916 - though of course any British presence on the Norwegian coast would place RN closer to Germany and had to be countered by naval means not invasion.
Plans had been made on Denmark though in the event Denmark wouldn't resist such; at least not in Jutland or on the banks of the Great Bealt!
Sweden would at this time still be exporting iron ore from Narvik. The internal railroads wasn't developed at this time as 26 years later so ore could be railed to Umeå for shipping during ice-free times. Some First Sea Lord may get ideas of blocking that at Narvik!
Denmark would continue trading with both sides if possible and may be able to supply substantial agricultural produce to a Sweden in want. If Sweden only DOW Russia Denmark may try limiting such to keep Sweden out of wars way; such action will of course not be possible if Sweden is part of the Central Powers for fear of Germany.
Any British designs on Norway may make the German Navy react - Fall N attack on Norway hadn't been drawn up at the outbreak of war and only been so by late 1916 - though of course any British presence on the Norwegian coast would place RN closer to Germany and had to be countered by naval means not invasion.
Plans had been made on Denmark though in the event Denmark wouldn't resist such; at least not in Jutland or on the banks of the Great Bealt!