All the little chicks with crimson lips, go...
Hey, get your stinking cursor off my face! I got nukes, you know.
I would think 3 MP would be sufficient and a range of 2 but I was playing on the Matrix PC version and it was not letting me move any in there at all. I am not playing with Option 19.
Three MP/two range is right (weather is irrelevant).
Is this is the problem, from 11.4.4?:
4. You can’t move naval units between the Baltic Sea and the North Sea (even via Fredrikshavn or Kristiansand) if major powers you are at war with control at least 2 of Oslo, Copenhagen and Kiel.