Young supporters of Kim Jong Il are preparing to 'wipe out' the USinfo-icon and Korea with five million nuclear bombs, the head of the republic's youth league has said. The chilling message from the Central Committee of the Kimilsungist-Kimjongilist Youth League warns that 'the Earthinfo-icon will break' if it launches an attack.

It promised to destroy the US and its South Korean neighbours if either shows 'a slight provocation,' as international tension reaches breaking point.The warning came as South Koreainfo-icon announced on a high-altitude rocket system to be built on its own soil, giving allies the US powerful weaponry on the peninsula.  North Koreainfo-icon's state-run Korean Central News Agency reported a spokesman saying the youths were 'keeping themselves fully combat ready to mercilessly wipe out with five million nuclear bombs the group of devils who are trying to bring a nuclear disaster to the inviolable country.' 

The warning comes as North Korea fired rockets and torpedoes at mock enemy warships during its 'largest ever' live-fire artillery drills on Tuesday.Kim Jong-Un's armyinfo-icon readied for warinfo-icon as they fired rockets and torpedoes at mock enemy warships during North Korea's 'largest ever' live-fire artillery drills on Tuesday.

Hundreds of tanks were lined up along the eastern coastal town of Wonsan in a show of military strength to celebrate 85 years since the North Korean army was created.Kim saluted the military as he watched the exercises on Tuesday, which involved the firing of more than 300 large-calibre artillery pieces and included submarine torpedo-attacks.

Today, South Korea conducted joint military live-fire drills with the US at Seungjin fire training field in Pocheon, South Korea, near the border with the North. And in a defiant bit of timing, South Korea have announced that key parts of a contentious US missileinfo-icon defense system have been installed. 

The South's trumpeting of progress in setting up the Terminal High-Altitude Area Defense system, or THAAD, comes as high-powered US military assets converge on the Korean Peninsula and as a combative North Korea signals possible nuclear and missile testing.

On the same day, a US guided-missile submarine docked in South Korea. 

And the USS Carl Vinson aircraft carrier is also headed toward the peninsula for a joint exercise with South Korea. The exercise took place as a US guided-missile submarine arrived in South Korea and envoys from the US, Japaninfo-icon and South Korea met in Tokyo to discuss the growing threat posed by North Korea's nuclear weaponsinfo-icon and missiles program. 

Speculation had mounted that the North could carry out a sixth nuclear test or another missile launch to mark 85 years since the founding of its army.The South's Yonhap news agency cited a government source as saying the exercise was the North's 'largest ever'.

Meanwhile, a senior analyst warned that the back-and-forth threats between the US and North Korea could cause a needless stumble into war.  On Monday, President Donald Trumpinfo-icon said dictator Jong-Un isn't as strong as he claims to be, and he blamed the international community for not doing more to rein him in. 

The 'status quo' on North Korea is 'unacceptable,' Trump told members of the United Nationsinfo-icon Security Council at the White House. 'The council must be prepared to impose additional and stronger sanctions,' Trump said.  

Senior analyst, Jonathan Pollack, at the Brookings Institution says the back-and-forth threats between the US and North Korea 'raises the stakes', according to CBS.'We could stumble needlessly into what would be the biggest crisis in East Asiainfo-icon since the United Statesinfo-icon intervened in the Korean War in 1950,' Pollack warned. 

'The situation prevailing on the Korean Peninsula is so tense that a nuclear war may break out due to the frantic war drills of the US imperialists and their vassal forces for aggression,' Gen Pakinfo-icon Yong Sik told a meeting of thousands of senior military and civilian officials.

South Korea's Joint Chiefs of Staff said it was closely watching North Korean military action in the Wonsan city area, where it said the drills were being held. The exercise involved 300 to 400 artillery pieces, but an official from Seoul's Defense Ministry couldn't confirm the details.

Flower-laying and bowing at statues and portraits of the leaders is a regular routine on major anniversaries. People also gathered in open spaces to take part in organized dancing, another common way to mark holidays.

'Our great leaders founded and wisely led our revolutionary army, and just like that, now our respected Marshal Kim Jong-Un is leading wisely, so even though the situation is tense, we are celebrating the day,' said Choe Un Byol, who came with his family to the bronze statues of the former leaders.