Kim Yo Jong, the sister of North Korea's leader Kim Jong Un, has issued another threat to the United States following Pyongyang's latest missile launch.

North Korea claims to have successfully tested a newly developed intercontinental ballistic missile called the Hwasong-18 on Wednesday.

Countries including the United States and Japan condemned the move at an emergency meeting of the United Nations Security Council on Thursday.

In a statement released on Friday via the state-run Korean Central News Agency, Kim Yo Jong said, "The price the US has to pay for its moves against the DPRK will never be low, and I do not conceal the fact that very unlucky things will wait for the US."

Kim, who is a high-ranking official in the ruling Workers' Party, criticized the UNSC for "unfair and prejudiced behavior," adding that the council has unjustly questioned North Korea's right to exercise self-defense.

Pyongyang is taking an increasingly confrontational stance against the United States ahead of July 27, which marks the 70th anniversary of the 1953 Korean War Armistice.