The country’s leader Kim Jong Un directly guided the test, the report said.
Kim said, according to KCNA, that the "new strategic weapon of the DPRK would make the whole world clearly aware of the power of our strategic armed forces once again."
"He stressed that our national defense forces would possess formidable military and technical capabilities unperturbed by any military threat and blackmail and keep themselves fully ready for long-standing confrontation with the US imperialists," the news agency added.
Japan’s vice defense minister Makoto Oniki said earlier the missile launched by North Korea landed just 170 kilometers west Japan's northern coast.
Oniki said the missile flew to an altitude of 6,000 kilometers, suggesting it was a "new type of ICBM."
Thursday's launch was the first long-range ballistic missile test North Korea has attempted since 2017.
North Korea has conducted several tests of reconnaissance satellite systems in recent weeks, most recently last week when it failed to launch an unidentified projectile.
A senior US official said recently that two recent missile tests conducted by North Korea were of a new ICBM system.
