But what the duck are people (including me) even discussing here? Within a year it has come so far that the US government alienated one of their most important allies and people discussing the possibility of a war against them.
Nobody ever invaded another country to improve the life of the citizen of the other country.
Countries get invaded to increase the power of the own country and that implies a less favorable outcome for the invaded country.
Dead Comment
Russia is an afterthought at best. They don't border us particularly directly in the arctic. They don't have a modern navy that poses us an actual threat. Even the strongest part of their army - their land army - isn't able to successfully invade a neighbouring country at this point. We don't even have a land border with them.
And to be blunt, RU/PRC is MORE aligned with Canadian position on Northwest Passage sovereignty. Which really only leaves US... i.e. the only actual on paper threat to NWP is US, which makes F35s terminally stupid acquisition for CAN arctic. But broad IMO is Canada simply doesn't need a strong air game because it won't survive vs adversaries operating in the north anyway. Geopolitically, Canada needs F35 to NORDAD dues/ransom more than it needs F35 for tactical/operational needs. Cue CAN buys f35, find them ruinously expensive to operate, and US will end simply "patrolling" Canadian airspace anyways.