North Korea’s leader Kim Jong Un says his country plans to develop more powerful means of attack, days after its first intercontinental ballistic missile (ICBM) launch since 2017.

The statement published by the official Korean Central News Agency (KCNA) on Monday suggests North Korea might perform additional launches or even test a nuclear device soon as it pushes to modernise its arsenal.

On Thursday, the country had its 12th round of weapons tests this year, launching the newly developed, long-range Hwasong-17, which analysts say is potentially able to deliver a nuclear warhead anywhere in the United States.

During a photo session with scientists and others involved in the Hwasong-17 test, Kim expressed a resolve to build up the country’s attack capability to cope with any threats, according to KCNA.

"Only when one is equipped with the formidable striking capabilities, overwhelming military power that cannot be stopped by anyone, one can prevent a war, guarantee the security of the country and contain and put under control all threats and blackmails by the imperialists,” KCNA quoted Kim as saying.

Kim said North Korea will develop more "powerful strike means” and that he expected his country to "more vigorously perfect the nuclear war deterrence of the country”, KCNA said.

Pyongyang said the Hwasong-17 flew to a maximum altitude of 6,248km (3,880 miles) and travelled 1,090km (680 miles) during a 67-minute flight before landing in waters between the Korean Peninsula and Japan.

Outside experts said if the missile is fired on a standard trajectory, flatter than the steep test angle, it could fly as far as 15,000km (9,320 miles), enough to reach anywhere in the US mainland and beyond.

Believed to be about 25m (82 feet) long, the Hwasong-17 is the North’s longest-range weapon and, by some estimates, the world’s biggest road-mobile ballistic missile system. Its size suggests the missile is meant to carry multiple nuclear warheads, given the North already has single-warhead ICBMs that could also hit most of the US.

US-led diplomacy aimed at convincing North Korea to denuclearise in return for economic and political benefits largely has stalled since 2019. The Biden administration has urged Pyongyang to return to talks without any conditions, but Pyongyang has responded Washington must drop its hostility first and has taken steps to expand his weapons arsenals.