Former U.S. President Barack Obama considered a pre-emptive strike on North Korea after it conducted its fifth nuclear test in September 2016, just days after lobbing three medium-range ballistic missiles 1,000 kilometers into Japan’s exclusive economic zone, according to a book by Watergate journalist Bob Woodward released Tuesday.

The nuclear blast — and claims by Pyongyang that it could mount the new bomb on missiles that put allies Japan and South Korea within striking distance — had deeply troubled Obama, Woodward wrote in “Fear: Trump in the White House.”

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