Hamish de Bretton-Gordon, a former British Army officer, is director of Doctors Under Fire, a campaign against attacks on hospitals in war zones. He is also the chemical, biological, radiological and nuclear adviser to the Union of Medical Care and Relief Organizations. The views expressed here are his own.
(CNN)Over the weekend, North Korea successfully tested what it claims to be a hydrogen bomb. After months of increasingly impressive missile launches — and threats from North Korean leader Kim Jong Un of striking the US territory of Guam — the reality of North Korea possessing a nuclear-tipped missile that could hit the US seems to be creeping ever closer.

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