When China last year revealed its newest stealth jet fighter, the defence industry was taken aback.
Executives of leading companies in the sector and military officials had not expected the J-20 to be as big or as technologically advanced as it appeared.
Nor had they expected it to resemble their own latest generation jet fighters quite so closely. But they did have a suspicion about where Beijing obtained some of the top-secret information that might explain why this was so.
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