Updated Nov. 26, 2013 12:11 p.m. ET
WASHINGTON—A pair of American B-52 bombers flew over a disputed island chain in the East China Sea without informing Beijing, U.S. officials said Tuesday, in a direct challenge to China and its establishment of an expanded air-defense zone.
The planes flew out of Guam and entered the new Chinese Air Defense Identification Zone at about 7 p.m. Washington time Monday, according to a U.S. official.
Over the weekend, Beijing said…