North Korea says leader Kim Jong Un observed the first test-firings of missiles from a newly launched destroyer and called for speeding efforts to boost his navy’s nuclear attack capabilities

North Korean officials blamed increased tensions with the U.S. and cooperative military drills with South Korea and Japan as reasons for the testing.

North Korea's Kim Jong Un has been pictured overseeing the 'Aegis Destroyer' warship missile test and the 'Choi Hyon', a heavily armed missile destroyer