Russia and China invaded the United States through Alsaka

I have read many scenarios, Russia, China will go through Mexico and would invaded the United States !, Why do not we assume they will easily place through Alaska to invade both Canada and the United States?

The number includes all military vehicles/aircraft/warship for nearly 10 million allied soldiers of Russia, China or more.

Both Russia and China currently has only two aircraft carriers, limits the number of fighters. I think the plan is to attack from Alaska compared to most effectively attack the city of Seattle in World in Conflict

Move with air shipping and ship each turn 100 thousand troops. Through the Bering Strait, Objective occupied major cities in Alaska as Anchorage, Juneau