China says will continue to 'modernise' nuclear arsenal, won't reduce stockpiles

China said on Tuesday it will continue to "modernise" its nuclear arsenal and called on the United States and Russia to reduce their own stockpiles a day after global powers pledged to prevent such weapons from spreading. There are growing global concerns about China's rapid military modernisation especially after its armed forces last year announced they had developed a hypersonic missile that can fly at five times the spread of sound. Watch this video for more.