Canada

I would argue that, because of the war in Ukraine, Russia no longer poses any threat to Canadian territorial integrity. They have 315,000 casualties - dead and injured - in this war. To put that into context, that is almost 90% of the initial deployment into Ukraine. They have spent so many resources into a war that they are actively failing in, there is no plausible means by which Russia can pose a threat to our territories within at least one or two generations. And just consider that the quality of the average Russian soldier has deteriorated significantly for so many reasons, but one most worth noting - it's barely a week of training for the average Russian recruit, and then straight to the frontlines in either Bakhmut or Avdiivka.

Look at any population pyramid with Russia, and you'll see that they are massively suffering from a lack of young people. And unlike Canada, which has many pro-immigration policies and attitudes which can attract a lot of people to make up for our lower birth rates, Russia is NOT a place where people want to emmigrate to, in large both because of its dire economic outlook (especially with all of the sanctions imposed by the US and the West), and also because it is insanely bigoted towards anyone who is not from Moscow or St. Petersburg.

Russia is wildly fucked, even if they were somehow to turn this around and somehow secure everything they ever wanted from Ukraine. If they are struggling this much with a former Soviet country almost next door to Moscow, there's no way they will ever be able to project their force beyond their shorelines. Their navy, or whatever boats they can use on the Pacific Coast, will never have enough supporting troops to ensure they could hold any amount of Canadian territory for any extended campaign, especially since their logistics is raw dogshit.

And that is all without talking about the massive, US-sized elephant in the room.