Every person in the rogue state knows what happened to their impoverished kingdom at the hands of Washington.

It is estimated 20% of the entire population of North Korea was killed by US bombs during the Korean War.

Kim’s grandfather – the founder of the DPRK – Kim Il-Sung saw the nation leveled with more than 600,000 tons of bombs.

All cities and towns hit with as the US Air Force in a scorched earth campaign throughout the brutal conflict between 1950 to 1953.

Tens of thousands of tons of napalm were used to firebomb large swathes of the country, burning much of it to the ground.

Horrific scenes of devastation are burned into the minds of North Koreans – and talk of “fire and fury” by Donald Trump are an echo uncomfortable in Pyongyang.

The event is described as the “original sin” of the US, historians said amid the growing nuclear crisis.

“The US pay for the bloodshed of Koreans and settle accounts with it with arms, without fail” Kim Jong-un.

B29 superfortress bombers buzzed over North Korea as they dropped more bombs than the US Air Force did in the ENTIRE Pacific Theatre during World War 2.

The North could not even defend itself from these carpet-bombing attacks, with its air power totally outclassed by the US.

It is claimed the US destroyed more cities in North Korea than it did throughout the entire of Germany and Japan.

US Air Force assessments record 18 out 22 cities in the country had been “at least half obliterated”.

Millions died in North Korea during the conflict, often referred to as the “forgotten war” due to its lack of attention in the West.

Kim said North Korea should force the US to “pay for the bloodshed of Koreans and settle accounts with it with arms, without fail” on a visit to a museum in 2015.

He added: “The museum is a source of the will to take revenge upon the enemy and a historic place bearing witness to the US imperialists’ monstrous atrocities.”

North Korea expert Robert E Kelly describes the bombing of the country as the “original sin” of the US.

“The US punishingly bombed North Korea during the Korean War, 1950-1953. Over a million died,” he wrote on an essay on his blog Asian Security.

He said the Kims have been taking action based on lessons learned in the wars, and have been building massive underground bunker complex to prepare for an bombers launched by the US.

US Air Force General Curtis LeMay, who led some of the bombing, spoke out about the brutal campaign in an interview in 1988.

He said: “We went over there and fought the war and eventually burned down every town in North Korea anyway, someway or another, and some in South Korea too.

“Over a period of three years or so, we killed off — what — 20 percent of the population vof Korea as direct casualties of war, or from starvation and exposure?”

Meanwhile, filmmaker Chris Marker who visited North Korea in 1957, recalled “extermination passed over this land. Who could count what burned with the houses?”

North Korea fears regime change by the US, a fear which is feeding Kim’s pursuit of nuclear weapons.

War drills held by the US and South Korea every-year feed these fears of Kim in the knowledge of what happened more than 60 years ago.

Pyongyang often talks about “justice” in its war heavy rhetoric – branding the US “warmongers” and vowing “merciless revenge”.

While North Korea celebrates the Korean war as a victory, it remains technically at war with their Southern neighbours after no peace treaty was signed – only an “armistice”.

It marks the July 27 anniversary as the Day of Victory, while in the South it is remembered as Armistice Day.

Brutality during the Korean War should be remembered as North Korea and the US continue to threaten war against one another.

Kim has ratcheted up tensions this year with repeated missile tests capped off with a H-bomb detonation in his quest for nuclear ICBMs.