A years-long conflict over cyberespionage, fair trade, superpower politics and supercomputers hit another big patch of awkward yesterday, following revelations the U.S. had banned the sale of off-the-shelf Intel Corp. processors to China.

The ban comes from the U.S. Department of Commerce, which accuses the organizations that built Tianhe-2, the world’s fastest supercomputer, of acting against the national security interests of the United States by using the Intel Corp. Xeon and Xeon Phi-based supercomputer for “nuclear explosive activities.”

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