China has significantly expanded its nuclear arsenal, now possessing 600 operational warheads, while enhancing the diversity and sophistication of its capabilities, according to a Pentagon report.

North Korea provided an uncommon look at a hidden facility for producing weapons-grade uranium, News.Az reports citing CBC .

North Korean leader Kim Jong-un announced plans to increase the country's nuclear arsenal "exponentially."

China has called on the United States to substantively reduce its nuclear arsenal and stop the proliferation of nuclear materials and technology.