Tokyo (CNN) North Korean state media on Friday renewed a threat to launch missiles toward the US territory of Guam, warning that "reckless moves" by the US would compel Pyongyang to take action.

North Korea first said it was examining a plan to target the Pacific island in August after US President Donald Trump warned the isolated regime would "face fire and fury like the world has never seen" following a US intelligence assessment that North Korea had produced a miniaturized nuclear warhead.

"We have already warned several times that we will take counteractions for self-defense, including a salvo of missiles into waters near the US territory of Guam," the KCNA report quoted Kim Kwang Hak, a researcher at the Institute for American Studies of the North Korean Foreign Ministry, as saying.

"The US military action hardens our determination that the US should be tamed with fire and lets us take our hand closer to the 'trigger' for taking the toughest countermeasure," Kim added.

The latest warnings from Pyongyang follow weeks of rising tensions, which promise to escalate further when US and South Korea joint naval exercises begin Monday.