[WAPO] ATHENS -- Greece acquiesced early Monday to a punishing ultimatum from European leaders, agreeing to lightning-fast passage of reforms and a pledge to strap itself in a fiscal straightjacket to save its banks and stay in the euro. After a marathon, 17-hour overnight session -- one of the most contentious diplomatic standoffs in European Union history -- the announcement of an unanimous deal was made in Brussels. It requires approval from several European parliaments.