US national security advisor reportedly held secret talks with top Russian officials to avert the use of nuclear weapons by the warring sides in Ukraine, according to a Wall Street Journal report.

North Korean leader Kim Jong-un stresses that his country will never surrender its nuclear arsenal or use it as a bargaining chip for denuclearization with the US, North's state media said on Friday.

North Korean leader Kim Jong-un says his country is fully ready to use nuclear weapons in any military confrontation with the United States and South Korea, amid escalating tensions on the Korean Peninsula.

US presidents’ sole authority to launch nuclear weapons pose a “real risk,” and should be relinquished, Democratic lawmakers told Joe Biden.