Not overthinking this. I believe that Canada should reexamine our role in NORAD, an organization that for almost 70 years has existed to shield the US from ICBM attacks from the former Soviet Union and now Russia. Did the Soviets ever have nukes pointed at Ottawa? If they did it was only because we were a vassal of the United States.
Donald Trump has freed us from the vassal state status. We now need to forge good relations with Russia and China, starting with trade. If we do that, then Canada never has to worry about Chinese or Russian ICBMs, for which there are no defenses against anyway. The question becomes, why are we paying to defend the United States? Canada pays 40% of the NORAD budget. Why? Canada is 1/10th the size of the US, and NORAD, as I have explained, really only exists to protect the US from incoming ICBMs.
In addition to Canada's disproportionate contribution to NORAD, the biggest contribution to the security of the US mainland that Canada provides is our huge land mass. Canada provides a ~2500-mile buffer between the United States and Russia free of charge! How much has that been worth to the Americans for almost 70 years? When you consider that the only threat facing the United States is the threat of incoming ICBMs (they don't have to worry about a land invasion), then it can be said that Canada is the most important security partner for the United States. No other country comes close. Name a country of more importance to the defense of the US mainland? And yet despite this fact, Donald Trump constantly sh*ts on Canada, repeating the big lie "we pay to defend Canada," and our meek "leaders" are silent.
No, we don't need F-35s. If the Americans are concerned about NORAD interoperability, then they can give us some F-35s for free.