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... Microsoft is using engineers in China to help maintain the Defense Department's computer systems -- with minimal supervision by U.S. personnel -- leaving some of the nation's most sensitive data vulnerable to hacking from its leading cyber adversary, a ProPublica investigation has found.

The arrangement, which was critical to Microsoft winning the federal government's cloud computing business a decade ago, relies on U.S. citizens with security clearances to oversee the work and serve as a barrier against espionage and sabotage.

But these workers, known as "digital escorts," often lack the technical expertise to police foreign engineers with far more advanced skills, ProPublica found. Some are former military personnel with little coding experience who are paid barely more than minimum wage for the work.

"We're trusting that what they're doing isn't malicious, but we really can't tell," said one current escort who agreed to speak on condition of anonymity, fearing professional repercussions. ...