North Korean leader Kim Jong-un has declared a resolve to further strengthen nuclear capabilities during a military parade held in Pyongyang, state media reported on Tuesday.During his speech on Monday night at the parade celebrating the 90th founding anniversary of the Korean People's Revolutionary Army (KPRA), Kim vowed to boost the country's nuclear capabilities at "the fastest rate", according to Pyongyang's official Korean Central News Agency (KCNA).The KPRA is the anti-Japanese…