This is actually a rather complicated question. The marriage of king Olav may have been invalid under British law. A law requires anyone in line for the throne to have permission from the sovereign to marry. There is an exception for descendants of princesses married to forreign princes. However, another law grants UK citizenship to every descendant of electress Sophia. This means that king Haakon was no forreigner.
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This is actually a rather complicated question. The marriage of king Olav may have been invalid under British law. A law requires anyone in line for the throne to have permission from the sovereign to marry. There is an exception for descendants of princesses married to forreign princes. However, another law grants UK citizenship to every descendant of electress Sophia. This means that king Haakon was no forreigner.