I mean, -60 is extremely unusual even in the high arctic, but the point stands at "just" -40.
It's usually more a matter of designers not bothering with severe cold conditions than any fundamental issue. In a pinch, I imagine just getting an FPV drone up to temperature in a tent or sleeping bag would give you a bit of range. For more, you'd need to insulate it and add a little internal heater, but that seems doable.
Most of what happens in the arctic is going to involve long-distance gas (or nuclear) powered equipment anyway. It's big and sparsely populated.
Sort of? Existing software isn't smart enough to fight a battle on it's own, and electronic warfare is a real thing that makes communications hard. In a full-blown war situation there's appeal in having a human being in a cockpit close to possible targets.
The things we worry about in Canada are more specific, though. For example, we probably don't need long-range bombers of our own.