Goose-stepping soldiers and marching bands filled the square, next to the Taedonggang River that flows through Pyongyang, in the hazy spring sunshine as tanks, multiple launch rocket systems and other weapons waited to parade.
North Korea exhibited its ballistic missiles and other military weaponry during a huge parade on Saturday to celebrate its founder's birthday.
However, Han committed to North Korea's response should the US retaliate.
North Korea shows its Pukguksong submarine-launched ballistic missile during a military parade in Pyongyang on April 15, 2017, in a photo from North Korean TV footage.
The Trump administration still has not ruled out military options in dealing with North Korea, according to the Times, and on Saturday, North Korean officials continued its tough talk against the United States.
The strikes are seen as an implicit warning to North Korea.
But if the parade signaled a readiness for war, North Korean leaders insisted the growing arsenal a way to ensure that the government in Pyongyang is not easily overthrown.
Also, whether Kim, flanked by high-ranking officials at a balcony overlooking the square, will make a speech is being closely watched.
This year's celebrations of the anniversary, known as "Festival of the Sun", came amid high tensions as Washington threatened to strike the East Asian country for its nuclear and missile tests.
On display for the first time were what appeared to be the Pukkuksong submarine-launched ballistic missiles (SLBMs), which have a range of more than 1,000 km (600 miles).
North Korea is ratcheting up already high tensions with a new display of military firepower, CBS News correspondent Ben Tracy reports. Analysts say the missiles could one day be capable of hitting targets as far as the U.S., although North Korea has yet to flight-test them.
"We're prepared to respond to an all-out war with an all-out war", said Choe Ryong-hae, believed to be the country's second most powerful official.
Speculation has been intensifying that U.S. President Donald Trump might order a pre-emptive strike on North Korea if it shows imminent signs of a significant provocation such as a sixth ever nuclear test.
But on Thursday amid much hype and secrecy, the North Korean leader surprised the press by showcasing a new skyscraper-lined street in Pyongyang.
In a call with his Russian counterpart Sergei Lavrov, Chinese Foreign Minister Wang Yi said late Friday the common goal of the two nations was to "bring all the parties back to the negotiating table", according to a statement on China's Foreign Ministry website.