The North also a year ago launched a long-range rocket that put a satellite into orbit, which Washington, Seoul and others saw as a banned test of missile technology.
Chinese tourists in Dandong, a city bordering North Korea, piled on to ferries and speedboats on Sunday as usual for cruises on the Yalu river and up-close views of North Korean border guards and villages.
As NPR's Merrit Kennedy reported earlier this week, the regime said it would "hold the USA wholly accountable for the catastrophic consequences to be entailed by its outrageous actions".
Submarine-launched ballistic missiles (SLBM) are paraded across Kim Il Sung Square during a military parade on Saturday, April 15, 2017, in Pyongyang, North Korea to celebrate the 105th birth anniversary of Kim Il Sung, the country's late founder and grandfather of current ruler Kim Jong Un.
Six-nation negotiations on dismantling North Korea's nuclear program in exchange for aid fell apart in early 2009.
One of Kim's top spokespeople, Choe Ryong Hae, today vowed North Korea would "beat down enemies with the power of nuclear justice".
Choe Ryong Hae said President Donald Trump was guilty of "creating a war situation" on the Korean Peninsula by dispatching United States forces to the region.
The North regularly launches short-range missiles, but is also developing mid-range and long-range missiles meant to target US troops in Asia and, eventually, the USA mainland.
Many outside analysts believe that North Korea has not yet mastered the technology to build warheads small enough to place on long-range missiles, though some civilian experts say it can already build nuclear-tipped shorter range missiles that have South Korea and Japan within its striking range.
The White House has said US President Donald Trump has put the North "on notice" while the possibility of US military action against Pyongyang has gained traction following US strikes against Syria on April 7.
"Trump is always making provocations with his aggressive words", Han Song Ryol said. "I have great confidence that China will properly deal with North Korea", he tweeted."If they are unable to do so, the USA, with its allies, will!"
No nuclear test or ballistic missile launch was conducted during the celebration of the 105th birthday of Kim Il Sung, the country's former supreme leader who died in 1994. "We've got a powerful nuclear deterrent already in our hands, and we certainly will not keep our arms crossed in the face of a USA preemptive strike".
The bomb drop has been seen as a sign from Trump to North Korea - to show them he is not afraid to act without warning. "Look, we've tried for 25 years across Republican and Democratic administrations to persuade the North Koreans to give up their quest for nuclear weapons". This year Kim Jong Un indicated that his nation is in the final testing phase of an intercontinental ballistic missile (ICBM) that could potentially hit the USA mainland.
"Actually what our objectives should be and what we need to do is explain to China that it's in their interest (to see North Korean regime collapse), despite years of policy to the contrary".
Trump has also been pressing China to do more to rein in North Korea, and has held out the offer of better trade terms for halting Pyongyang's nuclear program.
Recently North Korea condemned the US strike on a Syrian airfield as "an unforgivable act of aggression" and justified its nuclear weapons developments as "the right choice a million times over" because of it.
Kim has overseen three nuclear tests and a string of missile and rocket launches since taking over after the death of his father, dictator Kim Jong Il, in late 2011.
A series of what appeared to be KN-08 missiles were among the weapons rolled out on trucks.
Fears over the North's rogue weapons programme have soared in recent days, with a United States naval strike force deployed near the Korean peninsula, while President Donald Trump has warned the threat "will be taken care of" and Pyongyang has vowed a "merciless" response to any provocation. Under his watch, North Korea has aggressively pursued a goal of putting a nuclear warhead on an ICBM capable of reaching the USA mainland.
Eye witnesses said long-range and submarine-based missiles were shown at the anniversary parade on Saturday.