The likelihood of a US armed invasion of Canada (mirroring the Russian invasion of Ukraine) is steadily increasing. Before this becomes an imminent reality, the US must first complete its transformation into a dictatorial regime. An efficient domestic terror apparatus is required to quash internal dissent within the US, enable unrestricted reallocation of resources to the military, wage an effective war of conquest, subjugate the conquered populace, and exterminate any resistance. An invasion of Greenland is also likely to occur as a trial run before the big showdown.
It is somewhat possible that the political entity known as the United States of America will not survive such a metamorphosis, and will instead destroy itself in a civil war (which would be the preferable scenario from Canada's PoV). Nevertheless, the trajectory the American society has embarked on is unmistakable, and Canada would do well to establish security dialogue with China posthaste.