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

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