Earlier quoted context omitted.
> The fear about Russia or China is unfounded. That dismisses the greatest security threats of the era with a word. Most people in that field think those threats are very well-founded. Should Canada take the risk that everything will be fine? I don't know much about Canada's current plans and how effective they would be.
Canada right now is trying to figure out if the greatest their to their security is China or the USA. They can tie their boat to either against the other, but they can't be allies with both.
How do you get China in that list? Canada would most likely be challenged over their stake in the Arctic and Russia is plainly the greatest threat in that regard, not China. Russia has invested a great deal into arctic exploration and exploitation and pretty clearly sees the region as free real estate up for the taking. America too has a large stake in the Arctic, but has developed comparably fewer arctic capabilities than Russia. For Canada to have any chance of repelling a Russian invasion of their arctic territory would require America to help them, which under present American leadership would be a piss poor position for Canada to be in (not only because Trump has suggested annexing Canada himself, but also because he's said similar about Greenland, underscoring America's own desire to take that same arctic territory.)
Now, I don't doubt that China would also like the Arctic for themselves, but from Canada's perspective, the relative threat of China must be less than that of Russia and America.