> This seems like an extreme claim. I can't find any reliable source that claims that more bombs than the ones dropped in WWI and WWII combined were dropped to Korea.
I don't know about "WWI and WWII combined" but the US bombing campaign against Korea definitely was devastating. The US did bomb the absolute shit out of North Korean cities -- with more tonnes of bombs than in entire US war against Japan: https://en.wikipedia.org/wiki/Korean_War#Bombing_of_North_Ko... , https://theintercept.com/2017/05/03/why-do-north-koreans-hat...
Even US Generals concur:
General MacArthur: "The war in Korea has already almost destroyed that nation of 20,000,000 people. I have never seen such devastation. I have seen, I guess, as much blood and disaster as any living man, and it just curdled my stomach the last time I was there. After I looked at the wreckage and those thousands of women and children and everything, I vomited [...] If you go on indefinitely, you are perpetuating a slaughter such as I have never heard of in the history of mankind."
General O'Donnell: "I would say that the entire, almost the entire Korean Peninsula is a terrible mess. Everything is destroyed [...] There is nothing left standing worthy of the name."
General LeMay: "We burned down just about every city in North Korea and South Korea both [...]We killed off over a million civilian Koreans and drove several million more from their homes, with the inevitable additional tragedies bound to ensue", "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 -- twenty percent of the population of Korea as direct casualties of war, or from starvation and exposure?"