The following are key developments regarding North Korea this week.----------Aug. 18 -- Leaders of S. Korea, U.S., Japan reaffirm commitment to trilateral security cooperation19 -- S. Korea, U.S. launch key summertime military exerciseU.S. to stand by S. Korea, other allies against N. Korean threats: 2024 Democratic platform20 -- Korea denuclearization would remain goal if Harris wins White House: campaign officialBiden approved strategy to prepare against coordinated nuclear challenges from N.K., China, Russia: NYT21 -- Yoon says N. Korea will face 'end of regime' if it invades South22 -- N. Korean children not vaccinated against polio for 3rd straight year in 2023: WHO23 -- N. Korea slams U.S. approval of sale of Apache attack helicopters to S. KoreaRussian students return to N. Korea after 4-year hiatus over COVID-19Harris says she will not cozy up to dictators like Kim Jong-unSource: Yonhap News Agency