"If North Korea would be ready to attack the United States," Prime Minister Stephen Harper said in 2006, "that would be a risk for Canada's national security as well not only because of our common values, but because of our geographical proximity." Much has happened in the intervening years apparently enough, if media reports are accurate, to force Canada to revisit its noncommittal position on missile defence. The case for participating in missile defence can be boiled down to four words: threats, technology, allies and cost.
