U.S. President Donald Trump said on Thursday he still has a good relationship with North Korean leader Kim Jong Un, with whom he held several summits during his first term, and referred to North Korea once again as a "nuclear power.

SEOUL, South Korea — North Korea unveiled for the first time a nuclear-powered submarine under construction, a weapons system that can pose a major security threat to South Korea and the U.S.

U.S. President Donald Trump claimed Thursday to have a "great" relationship with North Korean leader Kim Jong-un, and described the recalcitrant country as a "nuclear power," as he has voiced openness to reengaging with the dynastic ruler.