I say we make friends with it.
I'm not entirely sure nuclear methods are the most effective. If it's a "spongy" rock then explosives will have little effect. I'm also doubting the world would be friendly enough to allow unrestricted nuclear use, considering we're all hyper-cynical and would freak, believing the nukes are directed at something on the ground rather than the asteroid itself.
Even against a common enemy, I doubt we will cooperate.
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