North Korean leader Kim Jong Un has inspected a facility that produces nuclear material and called for bolstering the country’s nuclear capability, state media reports.

South Korea rebuked President Trump’s remarks calling North Korea a “nuclear power,” raising concern about the relationship between the two countries. “North Korea’s denuclearization remains a

North Korean leader Kim Jong Un visits the country's nuclear material production base and nuclear weapons institute, at an undisclosed location in North Korea, in this photo released by North Korea's official Korean Central News Agency on January 29,

Kim Jong Un has inspected a facility that produces nuclear material and called for bolstering the country’s nuclear capability.

Kim Jong-un has inspected a nuclear-material production base and a nuclear weapons institute, emphasizing that strengthening the nuclear shield is "indispensable" amid a long-term confrontation with "the most vicious hostile countries.

Kim Jong Un vowed North Korea's nuclear program would continue "indefinitely" just days after Trump said he would make renewed diplomatic moves to the leader.