GLOBAL MARKETS-Oil falls, stocks waver in hectic trade as Fed meets

* Investors snap up beaten-down shares but Wall St ends lower* European stocks rebound while Bund slips to record low yield* Ruble falls again after rate hike to 17 percent* Moscow stocks plunge; crude trades below $60 a barrel(Recasts headline, first paragraph; adds bullet point)By Herbert LashNEW YORK, Dec 16 (Reuters) - Oil prices pared losses and global equity markets eased on Tuesday in rolle