Coal sales are an important source of revenue for Kim Jong Un's government, and the US says China has turned back some shipments in recent days.
He passed the leadership to his son, Kim Jong Il, who in turn passed it to Kim Jong Un.
Meanwhile, South Korean and American troops are preparing for joint military exercises, a regular event that Pyongyang has denounced as a prelude to an invasion.
Unlike at some previous parades attended by Kim, there did not appear to be any a senior Chinese official in attendance. "We have submarines, very powerful, far more powerful than the aircraft carrier", said President Donald Trump to Fox Business Network on Wednesday.
Expectations are high the North may put its newest missiles on display during Saturday's parade.
Kim did not speak during the annual parade, which celebrates the 1912 birthday of his late grandfather Kim Il Sung, North Korea's founding ruler, but a top official warned that the North would stand up to any threat posed by the United States.
"We will respond to an all-out war with an all-out war and a nuclear war with our style of a nuclear attack", said Choe Ryong Hae as translated by the BBC.
It comes amid mounting tensions in the region being visited by US Vice President Mike Pence.
North Korea saw the toppling of Saddam Hussein in Iraq and Moammar Gadhafi in Libya - neither of whom had nuclear weapons - as proof of the weapons' power.
The U.S. seeks nothing more than a "stable and economically prosperous Korean peninsula", not military conflict, the official said.
Director of Jilin University's Institute of Northeast Asian Studies Guo Rui said that Trump's domestic troubles should prevent him taking such action, while North Korea doesn't appear to be on a war footing.
"Trump is always making provocations with his aggressive words", Han Song Ryol said.
Pyongyang has also expressed anger over the ongoing annual spring military exercises the USA holds with South Korea, which it considers a rehearsal for invasion. Russian Federation and China are critical to any pressure campaign on North Korea because they both hold veto power on the U.N. Security Council.
Pence, who has called the North's failed missile test a day earlier "a provocation", said the USA and its allies will achieve its objectives through "peaceable means or ultimately by whatever means are necessary" to protect South Korea and stabilize the region.
Along with the deployment of the US aircraft carrier and other vessels into waters off the Korean Peninsula, thousands of USA and South Korean troops, tanks and other weaponry were deployed last month in their biggest joint military exercises.
President Trump's plans for reclusive North Korea, which has conducted several missile and nuclear tests in defiance of UN sanctions, regularly threatening to destroy the United States.
The North has said it has developed and would launch a missile that can strike the mainland United States but officials and experts believe it is some time away from mastering all the necessary technology.
"The president and his military team are aware of North Korea's most recent unsuccessful missile launch", Mattis said.
The White House foreign policy adviser traveling with Pence told reporters that the type of missile that North Korea tried to fire on Sunday was medium-range, and that it exploded about 4 to 5 seconds after it was launched.
Kim, the analyst, said it's likely that North Korea is also developing solid-fuel ICBMs, and that some of the rockets inside the canisters on Saturday might have been prototypes.
The North also showed off various other ballistic missiles including what it claims to be a submarine-launched ballistic missile (SLBM).
The Pukguksong-1 SLBM, which the US calls the KN-11, was first displayed and tested in April 2016.
Han dismissed the suggestion Trump made previous year during his presidential campaign that he was willing to meet Kim Jong Un, possibly over hamburgers. Pyongyang recently tested a ballistic missile and claims it is close to perfecting an intercontinental ballistic missile and nuclear warhead that could attack the USA mainland.
"However, North Korea has a habit of showing off new concepts in parades before they ever test or launch them", Hanham said.
Satellite photographs this week have shown activity around the North's Punggye-ri nuclear test site, which could be taken to indicate another underground nuclear test is imminent.
The North conducted two such tests previous year alone. 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.