The Soviets had already detonated an atomic bomb in 1949.
China has apparently deployed a prototype railgun on a navy ship.
China had said throughout 2016 and 2017 that they had made electromagnetic military technology advances. Chinese Admiral Ma proposed in 2017 that chinese warships would be equipped with lasers, railguns, and electromagnetically assisted missile launchers.
In 2016, retired Rear Admiral Zhao Dengping discussed plans for a follow-up warship to the Type 055 destroyer; a "Universal Combatant Ship" that would be equipped with laser, railguns, and, most intriguingly, electromagnetically assisted missile launchers, which could increase missile range.