What would Korean War II look like?

"IF China is not going to solve North Korea, we will." So thundered US President Donald Trump recently. Unfortunately, neither China nor North Korea appeared intimidated by this presidential bombast or Trump's Tweets.
What would "we will" actually entail? This clear threat makes us think seriously about what a second Korean War would be like. Memory of the bloody, indecisive first Koran War, 1950-53, which killed close to 3 million people, has faded. Few Americans have any idea how ferocious a conventional second Korean War could be. They are used to seeing Uncle Sam beat up small, nearly defenceless nations like Iraq, Libya or Syria that dare defy the Pax Americana.
The US could literally blow North Korea off the map using tactical nuclear weapons based in Japan, South Korea and at sea with the 7th Fleet. Or delivered by B-52 and B-1 bombers and cruise missiles. But this would cause clouds of lethal radiation and radioactive dust to blanket Japan, South Korea and heavily industrialised northeast China, including the capital, Beijing.
China would be expected to threaten retaliation against the US, Japan and South Korea to deter a nuclear war in next door Korea. At the same time, if heavily attacked, a fight-to-the-end North Korea may fire off a number of nuclear-armed medium-range missiles at Tokyo, Osaka, Okinawa and South Korea. These missiles are hidden in caves in the mountains on wheeled transporters and are hard to identify and knock out.
This is a huge risk. Such a nuclear exchange would expose about a third of the world's economy to nuclear contamination, not to mention spreading nuclear winter around the globe.
A conventional US attack on North Korea would be far more difficult. The North is a small nation of only 24.8 million. Its air and sea forces are obsolete and ineffective. They would be vaporised on the first day of a war. But North Korea's million-man army has been training and digging in for decades to resist a US invasion. Pyongyang's 88,000-man Special Forces are poised for suicide attacks on South Korea's political and military command and control, and to cripple key US and South Korean air bases, notably Osan and Kunsan.
North Korea may use chemical weapons such as VX and Sarin to knock out the US/South Korean and Japanese airbases, military depots, ports and communications hubs. Missile attacks would be launched against US bases in Guam and Okinawa.
Short of using nuclear weapons, the US would be faced with mounting a major invasion of mountainous North Korea, something for which it is today unprepared. It took the US six months to assemble a land force in Saudi Arabia just to attack feeble Iraq. Taking on the tough North Korean army and militia in their mountain redoubts will prove a daunting challenge.
US analysts have in the past estimated a US invasion of North Korea would cost some 250,000 American casualties and at least US$10 billion (RM44 billion), though I believe such a war would cost four times that much today. The Army, Air Force and Marines would have to mobilise reserves to wage a war in Korea. Already overstretched US forces would have to be withdrawn from Europe and the Middle East. Military conscription might have to be re-introduced.
US war planners believe that an attempt to assassinate or isolate North Korean leader Kim Jung-un – known in the military as "decapitation" – would cause the North Korean armed forces to scatter and give up. I don't think so.
My visits to South and North Korea have shown me that soldiers of both nations are amazingly tough, patriotic and ready to fight. I've also been under the Demilitarised Zone in some of the warren of secret tunnels built by North Korea under South Korean fortifications.
Hundreds of North Korean long-range 170mm guns and rocket batteries are buried into the hills facing the DMZ, all within range of the northern half of South Korea's capital, Seoul.
North Korea is unlikely to be a pushover in a war. Even after US and South Korean forces occupy Pyongyang, the North has prepared for a long guerilla war in the mountains that could last for decades.
They have been practising for 30 years. Chaos in North Korea will invite Chinese military intervention, but not necessarily to the advantage of the US and its allies.
Is Commander-in-Chief Trump, who somehow managed to avoid military service during the Vietnam War, really ready to launch a big war in Asia? Most Americans still can't find Korea on a map. Will Congress tax every American taxpayer US$20,000 to pay for a new Korean war? Will Russia sit by quietly while the US blows apart North Korea? Does anyone in the White House know that North Korea borders Russia and is less than 200km from the key Russian port of Vladivostok?
All this craziness would be ended if the US signed a peace treaty with North Korea ending the first Korean War and opened up diplomatic and commercial relations. No need for war or missile threats. North Korea is a horrid, brutal regime. But so is Egypt, whose tin pot dictator was wined and dined by Trump recently.
But pounding the rostrum with your shoe is always much more fun than boring peace talk
Eric S. Margolis is an award-winning, internationally syndicated columnist, writing mainly about the Middle East and South Asia. Comments: letters@thesundaily.com