South Korea's defense ministry on Friday said it has detected activity at North Korea's nuclear test site to restore tunnels that were dismantled in 2018.In May 2018, North Korea said it had demolished the Punggye-ri site, which the secretive regime had announced it would close the previous month, apparently to signal its commitment to denuclearization.But subsequent direct talks between North Korea and the United States on Pyongyang's denuclearization failed to make headway before then President Donald Trump left the White House in January last year.Earlier this week, a U.S. nuclear expert…READ FULL ARTICLE