NORTH Korean tyrant Kim Jong-un might launch another missile TOMORROW to celebrate the anniversary of the founding of the brutal regime.

South Korea fears the dictator may launch another intercontinental ballistic missile when it celebrates the milestone tomorrow.

5 Kim Jong-un inspects a warhead in this photo released by the tyrannical regime Credit: Reuters

5 North Korea says its firing of a missile over Japan was "the first step" of military operations in the Pacific Credit: AP:Associated Press

Seoul's Unification Ministry spokeswoman Eugene Lee said Friday that Pyongyang could potentially conduct its next missile tests this weekend or around October 10 - another North Korean holiday marking the founding of its ruling party.

North Korea has previously marked key dates with displays of military power, but now its tests appear to be driven by the need to improve missile capabilities.

The North held its sixth and the most powerful nuclear test to date on Sunday in what it claimed was a detonation of a thermonuclear weapon built for its intercontinental ballistic missiles (ICBM).

The country tested its developmental Hwasong-14 ICBMs twice in July and analysts say the flight data from the launches indicate the missiles could hit the US, including major cities such as Los Angeles and Chicago.

US President Donald Trump said yesterday that military action is "certainly" an option against North Korea and a senior administration official said America was still assessing last weekend's underground explosion.

"Military action would certainly be an option," Trump told a White House news conference. "I would prefer not going the route of the military, but it's something certainly that could happen."

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Pressed on whether he could accept a scenario in which the isolated nation had nukes but was "contained and deterred," Trump demurred. "I don't put my negotiations on the table, unlike past administrations. I don't talk about them. But I can tell you North Korea is behaving badly and it's got to stop," he said.

Last month North Korea fired a powerful new intermediate range missile, the Hwasong-12, over northern Japan.

Kim called the launch a "meaningful prelude" to containing the US Pacific island territory of Guam and called for his military to conduct more ballistic missile launches targeting the Pacific Ocean.

Meanwhile, Sweden today urged its citizens to refrain from unnecessary trips to North Korea.

The announcement by the Swedish Foreign Affairs Ministry came hours after Mexico's government ordered North Korean Ambassador Kim Hyong Gil to leave the country within 72 hours in response to Sunday's nuke test.

5 Residents cover their heads while taking shelter during an evacuation drill for North Korean missiles in Wajima, Ishikawa prefecture in Japan Credit: AFP

5 South Korean bombs hit a mock target at a shooting range in Gangwon Province, east of Seoul, in an exercise seen as a warning to the North Korean regime Credit: Handout - Getty

The United States has already banned Americans from travelling to North Korea following the death of Otto Warmbier, a 22-year-old college student from Ohio who was released from North Korea in June in a coma after being detained there for more than a year.

Sweden has had diplomatic relations with North Korea since 1973.

The Swedish Embassy in Pyongyang also provides consular services for the United States, Australia and Canada.

And today French President Emmanuel Macron and Chinese President Xi Jinping discussed North Korea in a phone call.

Macron called for more pressure on North Korea to bring the country back to the negotiating table, and China's official Xinhua News Agency described Xi as being "adamant" about denuclearisation while also expressing hope that France would play "a constructive role in easing the situation and restarting dialogue."

5 North Korea's launched a ballistic missile over Japan's territory Credit: EPA

South Korean experts say that the launch was Pyongyang's attempt to make missiles flying over Japan an accepted norm as it seeks to test new projectiles in conditions close to operational and win more military space in a region dominated by enemies.

Kim has conducted four of North Korea's six nuclear tests since taking power in 2011.

His military has ramped up weapon tests, which includes solid-fuel missiles built to be fired from road mobile launchers or submarines.

In accelerating his pursuit of nuclear weapons targeting the United States and allies South Korea and Japan, Kim appears to be seeking a nuclear deterrent to help ensure the survival of his government.

Washington, Seoul and Tokyo have been pushing for stronger sanctions to punish Pyongyang over its nuclear activities, such as denying the country oil supplies. China and Russia have been calling for talks, saying sanctions aren't working against North Korea.

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