North Korea's Kim Yo Jong, the powerful sister of leader Kim Jong Un, criticised the Trump administration for stepping up "provocations" and said it justified the nuclear state increasing its nuclear deterrent,

North Korean leader Kim Jong-un visited Kim Il Sung University of Politics on the 80th anniversary of its founding, stressing that "arms without ideology are little short of ironware," according to North's state media on Tuesday.

North Korea's Kim Yo Jong, the powerful sister of leader Kim Jong Un, criticised the United States' "policy of confrontation" and said it justified the nuclear state increasing its arms, state media KCNA said on Tuesday.