North Korea has said it had successfully tested a solid-fuel intercontinental ballistic missile, hailing it as a key breakthrough for the country’s nuclear counterattack capabilities. “A new-type ICBM, Hwasong-18, which will fulfil its mission of an important war deterrent as the future core pivotal means of the strategic force of the DPRK (North Korea), was test-fired,” the official Korean Central News Agency said on Friday.