Sounds like it was that Norway stopped exporting oil which western nations depended on and then asked Russia to invade Norway to get it going again.
Yes, the loss of Norwegian exports would have had the effect of raising oil prices globally. But not by enough to make the US stand by while Russia starts mowing down NATO countries. That would be considered a Big Deal over here, even in light of pro-Russian GOP sentiment.
The idea that we'd chill out while Russia invades Norway... I mean, you could come up with a way to make that sound plausible, but it would almost have to be the central theme of the whole show.