It's a message to the small group of adversaries with SLBMs and ICBMs.
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Unlike a previous SLBM test in May, it was not announced at the time.
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However, in recent years it has made rapid progress in its SLBM program, NTI said in a report late last year.
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It would also modify a small number of existing submarine-launched ballistic missile, or SLBM, warheads to provide a nuclear option with a lower payload.
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While inspecting a new missile modeled upon SLBMs in 2017, he said the country's rocket industry had "firmly transitioned" to solid fuel from liquid propellants.
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On display for the first time were what appeared to be the Pukkuksong submarine-launched ballistic missiles (SLBMs), which have a range of more than 1000km.
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It limits deployed intercontinental ballistic missiles, submarine-launched ballistic missiles and nuclear bombers to 700 and non-deployed ICBMs, SLBM and bombers to 800.