O Canada

They'll have to be taught from sucking eggs.

The United States will decide when to fire missiles over Canadian airspace whether Canada likes it or not, says America's ambassador. The blunt warning from Paul Cellucci came minutes after Prime Minister Paul Martin announced yesterday that he will not sign on to the controversial U.S. missile defence program.

[...]

Instead of joining missile defence, Canada will work on border security, reinforcing coastal and Arctic sovereignty and expanding the military.

[...]

[America's top envoy to Canada, Paul Cellucci, responded:] "We simply cannot understand why Canada would, in effect, give up its sovereignty -- its seat at the table -- to decide what to do about a missile that might be coming toward Canada."

The warning was no slip of the tongue -- Cellucci repeated several times that Canada's decision had handed over some of its sovereignty to the U.S.

[...]

News of Canada's decision quickly appeared on news websites around the world. Many countries oppose the American plan.

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Supporters of the program contend Canada will sit on the sidelines without any say over how the system is used, without any access to billions in related research contracts, and without any political credit from Washington.

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Opponents argue the scheme could trigger a new arms race, question why it's necessary in a post-Cold War climate, and note that the anti-missile technology is unproven.
  Canoe article

Yes, but it puts big money in the defense industry's coffers. And that's where BushCo makes their personal profits.

In reality, it doesn't matter what Canada says, if a missile should be launched toward the U.S. through Canadian airspace, the U.S. would attempt to shoot it down. Knowing that, and not expecting otherwise, Canada's refusal to sign on to the program seems to me to actually be wise. They won't be saddled with any of the cost, and the current Martin government will keep the support of the Canadian people. So, actually, they can consider themselves more sovereign by not signing. The U.S. is just going to be pissed and I expect Washington will try to browbeat P.M. Martin, because the refusal is another incidence of another country defying U.S. demands.

....but hey, do what you want....you will anyway.