U.S. President Donald Trump and North Korean leader Kim Jong Un are set to hold their second summit on Wednesday and Thursday in Vietnam as they bid to break an impasse over Pyongyang's possession of nuclear weapons and ballistic missiles.After reaching a vague denuclearization agreement in the first-ever U.S.-North Korea summit in June last year in Singapore, Trump and Kim are expected to broach the possible dismantlement of North Korea's main nuclear complex in Yongbyon in exchange for a declaration of a formal end to the 1950-1953 Korean War or partial sanctions relief, according to anal…READ FULL ARTICLE