NEW YORK/TOKYO (Reuters) - U.S. stock index futures fell sharply after a Republican proposal for averting the "fiscal cliff" failed to muster enough support on Thursday, raising concerns lawmakers won't be able to come to a deal, putting the world's largest economy at risk of recession. S&P 500 E-Mini stock futures plunged on the news in a matter of seconds - falling as much as 3.6 percent in a mini "flash crash" that even caused a halt in trading of one March E-Mini futures contract because of the sharp move. The market rebounded from there, but futures were still down 1. ...

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