China has threatened to veto any Chapter VII resolution authorizing invasive force.  Their policy has been to give Sudan a free hand in exchange for its oil.

Although to be fair, Russia isn't really all that much better, and perhaps it's wishful thinking to hope they would join in what would be, indeed, an invasion.

But again, they've been getting away with this because they know that neither Western nor Arab countries really give a rat's ass black African victims.  Likewise, Russia backed Serbia for a long time, but retreated when it became clear intervention was finally going to happen.

Keep in mind that we are already too late to stop genocide in Darfur - it is a done deal, and over 400,000 are already dead.  The question is how to stop it from spreading into Chad and CAR and turning the whole region into flames.  We could have another Congo on our hands here very soon.