North Korean leader Kim Jong Un and U.S. President Donald Trump both arrived in Vietnam on Tuesday, the eve of their second summit at which they will tackle how to implement a North Korean pledge to give up its nuclear weapons.

the past has presented "many obstacles" but that they "overcame all of them," said Kim Jong Un.

North Korean media stepped up their rhetorical attacks on South Korea and joint military exercises with the United States, warning Tuesday that a budding detente could be in danger.