Sure, but Canada’s military isn’t going to make a difference when the worlds most powerful military - , is going to also be fighting Russia in this circumstance… from home soil. This would be an absolute suicidal attack from Russia, which even if they did, would be taken out by the US before we had a chance to do anything. We would have to increase spending to four times of what we do now to even match what Russia spends, let alone what the USA does (that would be what, 37 times what we spend now).
And for what? You think a Russian incursion is going to make it anywhere near American airspace? What exactly is our ‘increased military spending’ going to do, exactly?