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Word is, Mattis is visiting Korea and Japan to reassure them about ongoing American defense commitment, in the wake of alarming statements his chief made on the campaign trail. Seoul and Tokyo will be seeking clarity on Trump's security stance which has, thus far, been as clear as mud. But with Trump having made crystal clear that he wants allies to cough up more for the protective aegis US forces represent, there will likely be private tough talking as well as public back-slapping. .
Despite Trump's apparent isolationist tendencies, one issue unlikely to be tabled is an American regional withdrawal. But let us, for a moment, think the unthinkable. If United States Forces Korea, or USFK, pulled back to Fortress America - is South Korea vulnerable to invasion?
No.
Despite fears of a repeat play of June 1950, Kim Jong-un's forces are in no shape to storm south. They are 1.1 million strong and boast abundant firepower, but have poor air assets, command-and-control and targeting systems and suffer from fuel shortages and decrepit kit.
North Korea's threat is not conventional, it is asymmetric: its massive special operations force and its nuclear missiles. Speaking very broadly, we can discount special forces: Though useful tactical assets, they are not war winners by themselves. And their original purpose - to ferment/support rebellion in the South – has evaporated: South Koreans may impeach their own presidents, but will not heed North Korean calls for revolution.
Since Kim III came to power, his major investments have been in missile and nuclear technologies. This is important, for nuclear missiles are not offensive weapons.
Kim knows that if he used nuclear weapons, it would spell the end of him and his regime. Moreover, nukes are of minimal use to invaders – who wants to (or is equipped to) conquer a radioactive wasteland? The arsenal is a deterrent against U.S. regime changers, not South Koreans.
Meanwhile, South Korea deploys 630,000 troops. Military wisdom demands a 3-1 ratio for attacking forces; the North, with half the South's population, cannot achieve this. Moreover, the South's economy is 35 times bigger than the North's, so its lads wield the kind of big boys' toys their northern cousins can only gape at.
So if – big "if" – USFK ever withdrew, the South is secure. While Pyongyang might intensify in-and-out pinprick attacks – commando, terrorist, artillery or naval strikes - it is ill equipped to engage in extended hostilities, let alone invade. For every strategic, demographic and economic reason, South Korea can defend itself.
Yet even if USFK's mission - invasion deterrence - looks outdated, it has been and is a tremendous gift to South Korea.
In 1950-3, GIs saved this nation from extinction. In the years since, USFK has provided a shield behind which Korea industrialized, democratized and prospered. It delivers a vital comfort factor for foreign investors, global financial institutions that lend to Korea, and credit raters assessing Korea risk. And it removes a colossal burden from South Korea's budget: Uncle Sam's capabilities and assets are staggeringly expensive.
While it is impossible to calculate the dollar value USFK has gifted Korea over the last seven decades, my guess would be the hundreds of billions. (Demonstrators might consider this the next time they protest USFK…)
So, I respectfully suggest that South Korea's next president, however leftist he may be, should not wobble on Terminal High Altitude Area Defense (THAAD).
Yes, THAAD has prompted bullying from Beijing. Yes, Korean companies are suffering economic fallout in their biggest market. And yes, it is of limited use in defending South Korea. (North Korea does not need an intercontinental ballistic missile to unleash atomic Armageddon in the South.)
However, THAAD provides useful perimeter defense for the U.S.
This is critical. The US-Korean alliance is reciprocal and it is reasonable for Korea to do America a favor. Amid "America First," it would be foolish to reverse course on THAAD. That might indicate to "Mad Dog" that Korea cannot be trusted to keep its commitments, and that maybe - just maybe - it no longer requires American defenders.
Andrew Salmon is a Seoul-based reporter and author. Reach him at andrewcsalmon@yahoo.co.uk.