North Korean leader Kim Jong-un has vowed to strengthen his country’s nuclear capabilities " without limits " in response to perceived threats from the US, Japan, and South Korea , according to state media reports. Speaking at a conference for Battalion Commanders and Political Instructors of the Korean People’s Army (KPA) on Friday, Kim urged military officials to prioritize completing war preparations. Kim 's comments come amid escalating tensions between North Korea , the US, and its allies.