North Korean hackers tried to break into the computer systems of pharmaceutical giant Pfizer in a search for information on a coronavirus vaccine and treatment technology, South Korea’s spy agency said Tuesday, according to a South Korean lawmaker.

The impoverished, nuclear-armed North has been under self-imposed isolation since closing its borders in January last year to try to protect itself from the virus that first emerged in neighboring China and has gone on to sweep the world, killing more than two million people.

Leader Kim Jong Un has repeatedly insisted that the country has had no coronavirus cases, although outside experts doubt those assertions.

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