Seven years ago, stealth technology allowed the U.S. Air Force to dominate all comers while Chinese pilots often refused to fly at night or in bad weather. Today, a next-generation Chinese stealth fighter jet to rival America's best is undergoing flight tests.

In a few years, Chinese fighter-bombers invisible to radar will dominate the skies of East Asia. China has gained that ground not by hard-earned feats of engineering, but by stealing secrets through cyberespionage.

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