Sources: in late 2020, the NSA discovered that Chinese hackers had access to Japanese defense networks, with the problem persisting until at least early 2021 (Ellen Nakashima/Washington Post)

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Ellen Nakashima / Washington Post:
Sources: in late 2020, the NSA discovered that Chinese hackers had access to Japanese defense networks, with the problem persisting until at least early 2021  —  Tokyo has strengthened its defenses after a major cybersecurity breach, but gaps remain that could slow information-sharing with the Pentagon

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