He criticized the new USA government under President Donald Trump for "creating a war situation" on the Korean Peninsula by dispatching strategic military assets to the region.
North Korea displayed its submarine-launched ballistic missiles (SLBM) for the first time on Saturday ahead of a massive military parade in the capital, Pyongyang.
The country's hereditary leader Kim Jong-un, wearing a black suit and white shirt and a tie, welcomed his country's bravest as he addressed thousands of soldiers who took part in the parade honoring his grandfather.
South Korean military officials said they regard it as a new type of ICBM.
Kim Jong Un didn't speak before North Korean television ended the live broadcast.
North Korean school children perform at the Mangyongdae Children's Palace in Pyongyang while an image of their late leader Kim Il-sung is projected on a screen Friday, April 14, 2017.
North Korea on Saturday unveiled what appears to be its new intercontinental ballistic missile (ICBM), staging a large-scale military parade in Pyongyang amid increased military tensions on the peninsula.
The North's leader said in his New Year's message that the country has entered the final stage of preparing to launch an ICBM capable of hitting the US mainland.
Renowned Montreal HIV researcher Dr. Mark Wainberg drowns at 71
He found him and began to swim back to the shore. Wainberg was taken to hospital, where he died. Wainberg had once again returned to the lab.
The country's biggest national holiday, called the Day of the Sun, came amid growing speculation that Pyongyang could conduct its sixth nuclear test or launch missiles around key anniversaries in April.
Trump has repeatedly said he will prevent Pyongyang from its goal of developing a nuclear-tipped ballistic missile capable of reaching the mainland United States. The North also previous year launched a long-range rocket that put a satellite into orbit, which Washington, Seoul and others saw as a banned test of missile technology.
In a show of strength, the USA deployed the USS Carl Vinson aircraft carrier group to waters near the Korean Peninsula in response to recent North Korean missile tests.
Earlier Saturday, North Korea warned the United to end its "military hysteria" or face retaliation as a USA aircraft carrier group steamed towards the region and the reclusive state marked the 105th anniversary of the birth of its founder and the current leader's grandfather, Kim Il-sung.
However, a miffed North Korea's response was a warning of a "merciless" response to any move by the "reckless" Trump government, according to a North Korean Army spokesperson's statement to state-run news agency KCNA.
Pyongyang has expressed anger over the annual spring military exercises the US holds with South Korea, which it considers an invasion rehearsal.
Officials in Pyongyang said the country would "ruthlessly ravage" the USA if Washington opted for an attack in response to a North Korean weapons test. Counteractions would occur "in such a merciless manner as not to allow the aggressors to survive", the army statement said. It has warned of a nuclear attack on the United States in retaliation for any sign of aggression, a threat that has been made numerous times in the past.
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