The powerful sister of North Korean leader Kim Jong Un has dismissed the U.S.’s intent to resume diplomacy on North Korea’s denuclearization

Kim Yo Jong, sister of North Korea's leader Kim Jong Un attends wreath laying ceremony at Ho Chi Minh Mausoleum in Hanoi, Vietnam March 2, 2019. Kim Yo Jong shows a document to her brother, North Korea's leader Kim Jong Un as U.

North Korea has ​doubled down on expanding its nuclear fleet and continued its criticism of the U.S., although it has refrained from personal attacks on Trump.