Last I checked, “losing” Canada wouldn’t cut us off from our only warm weather port, would it?
So, if Canada cut us off from a port of some kind, or some other resource, it's okay to murder and pillage them to get that access? This is imperialism, and if Russia is really a peaceful country, it should operate under the rule of law and maintain its treaties and other agreements, rather than violating them through invasion and illegal seizure.