Come on, you are old PDF member here. You thought American is protecting South Korea? Of course not.
It's the same game in Europe, ME, East Asia is nothing new. The US bully North Korea, so that North Korea will put their guns on the head of South Korea.
South Korea is the hostage of both North Korea and US. If South Korea does NOT obey, US will threaten to initiate a war against North Korea, so that both Korea will be destroyed.
It doesn't matter how strong South Korea is, actually South Korea spent 43 billions USD on defense in 2018, while Pakistan defense budget is 11 billion in 2018. But but Seoul(汉城) is within the artillery of North Korea, which is more than 1/3 of South Korea GDP and 10 millions population under direct threat.
No matter how much South Korea spent on defense, Seoul is dead if war break up. Not to mention Nukes which North Korea holds.
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