>>/38222/
Denmark only has 5 million people, Norway 4 million, Sweden 10 million, Iceland 300,000, Greenland 50,000. If all those came together, that'd be around 20,000,000 people. 
Swedish Finland should be taken from Finland, Murmansk should be taken from Russia, and the rest of Slesvig should also be seized from Germany, force them to fill up the Kiel Canal, and also maybe take Hjaltland and Orkney.
Scandinavia can thus be a great power and easily reject foreign cancer.