False.
Germany invading Norway isn´t the same as UK invading Norway and to expect drastic diplomatic incident with Sweden for example, specially if they don´t go all the way with the plan, is nonsense. Germany was widely recognized as much more agressive. Besides, the plan was only occupying Narvik and not all of Norway. The brits were more than aware that complete occupation was pointless.
And this goes back to my point earlier that there's a big difference between garrisoning Norway with 300,000 men and garrisoning it with far less. At a certain point, Norway ceases to be worth the cost of occupying it. There are situations where it might be worth the effort to occupy for either side, but both the Allies and Axis have other commitments.