After months of ruminating Canada's Liberal Party government rejected an offer to partner with the United States on missile defense. Had the U.S. not asked there would have been howls of anger from the neighbors replete with the trope of the relationship being 'parental' in nature.
But they said no. Okay, well enough. Would they have ever said yes? Not likely. It's more likely that they wanted the US to ask -so that they could say no.-
One almost expects to hear: "ask me again, daddy!" but that will come likely from the Canadian media's next matter of pivotal interest – which generally amounts to “it’s all about Traaaaaaade!”, they seek an advantage at every turn, especially when the US is in a bind.
What's more is that the Canadian government wants to be asked by the United States if they want an incoming missile aiming for Canada to be targeted. 15 minutes is hardly enough time to 'commission a white paper' in any event. So what Canada has done is consciously given the strategic advantage to the attacker - eliminate the critical time advantage, guarrantee that they become the proxy target, and automatically turn themselves into an American enemy in the event of an attack, essencially doing away with the deterrent value of BMD.
Mr. and Mrs. MacDonald sure are fickle neighbors.