测试由领导人金正恩监督，标志着第九次也是最后一次在地面上进行的固体燃料发动机试验，该发动机由碳纤维制造，能够产生1971千牛的推力，比之前的型号更强大。此公告是在金正恩在2019年与美国的核谈判失败后加大测试活动的背景下发布的，彼时特朗普总统的第一任期刚刚开始。
来源
Kim Jong Un oversees test of new rocket engine for ICBMs, North Korea says
North Korea's Kim oversees ICBM engine test: state media
N Korea's Kim Jong Un heralds new ICBM rocket engine test as 'significant'
North Korea conducts its final ground test of a solid-fuel engine for long-range missiles
Coreea de Nord testează un nou motor de rachetă cu combustibil solid, „o provocare semnificativă pentru sistemele de apărare”
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