
In August, North Korea said it had successfully tested a submarine-launched ballistic missile, after failing on several earlier attempts.
And earlier this month, North Korea launched four ballistic missiles at the same time.
SEOUL, South Korea ? North Korea conducted a ground jet test of a newly developed high-thrust missile engine, the country?s state-run news media said on Sunday, even as Secretary of State Rex W. Tillerson is in the region discussing tougher strategies to help end the North?s nuclear and missile programs.
Although North Korea has never flight-tested an intercontinental ballistic missile, it has recently demonstrated significant progress in its missile programs with new engines that could potentially deliver a nuclear warhead as far away as the United States.
Last month, it launched a new type of intermediate-range ballistic missile it said could carry a nuclear payload.
 

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