How would you protect your planet?

[Opium]

I'd rename it "Canada" and sleep secure in the knowledge that nobody would ever find it.

Canada IS a really sweet country! Grr!

So, yes, while I would call my planet "Canada" and live a relativly peaceful, educational, peace-keeping life, in the case the the Cardissians framed us for some grevous misdeed...
My plan to defend my planet: An army of John and TopHatMan clones, that regenerate and never die. And all of them would wear tophats that were actually weapons.

But before we got to that point, we would have charmed and helped the Federation so much that they will have us join, because we are really good peacekeepers. Then Canadians would be sent to disfuse bad situations, or clean up after the Federation made a mess of things.