N Korea threatens more launches after fourth test in 12 days

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North Korea threatened Tuesday to carry out more weapons tests after it fired its fourth set of projectiles in less than two weeks following the start of joint exercises between the US and the South.

The rising temperature on the peninsula threatens to derail putative negotiations between Pyongyang and Washington, with the North saying the combined drills were a "flagrant violation" of the process.

Pyongyang has always been infuriated by military exercises between the South and US, seeing them as rehearsals for invasion, but in the past it has tended to avoid carrying out missile tests while the war games were taking place.

The speed of its statement Tuesday was also unusual, coming within an hour of it carrying out its launch, rather than its usual practice of a day later.

The North fired "two projectiles that are assumed to be short-range ballistic missiles" from South Hwanghae province on its west coast, Seoul's Joint Chiefs of Staff said in a statement.

They flew around 450 kilometres across the peninsula and into the East Sea, also known as the Sea of Japan, reaching an altitude of 37 kilometres and a speed of "at least Mach 6.9", they said.

That puts them around the middle of the range of the projectiles that have been fired by the North four times in the past 12 days.

Seoul has described most of them as short-range ballistic missiles -- the North is banned from ballistic missile launches under UN Security Council resolutions -- while Pyongyang has said some were a "large-calibre multiple-launch guided rocket system".

The latest launch came after the South Korean and US militaries began mainly computer-simulated joint exercises on Monday to test Seoul's ability to take operational control in wartime.

Less than an hour after the North's weapons test, an official of its foreign ministry said the drills were "an undisguised denial and a flagrant violation" of the diplomatic process between Pyongyang, Washington and Seoul.

All joint drills between the South and the US were "aggressive war exercises simulating the surprise and preemptive attack on the DPRK", the spokesperson said in a statement carried by the official KCNA news agency.

"So we are compelled to develop, test and deploy the powerful physical means essential for national defence," the official added. "The US and south Korean authorities cannot counter this even though they have ten mouths."