N Korea fires possible missile into sea amid stalled talks

Hypersonic weapons, which fly at speeds in excess of Mach 5, or five times the speed of sound, could pose a crucial challenge to missile defense systems because of their speed and maneuverability. Such weapons were on a wish-list of sophisticated military assets Kim unveiled last year along with multi-warhead missiles, spy satellites, solid-fueled long-range missiles and submarine-launched nuclear missiles.




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