They border china. China doesn't want us that close to the border. Simple as that.
If we invaded them without china's blessing, and we pulled another Macarthur and pushed them to the Chinese border and then pushed more (like he wanted to do before Truman fired his ass for insubordination), it would likely ignite a larger conflict with our biggest trade partner that holds (literally) trillions of our debt.
They border china. China doesn't want us that close to the border. Simple as that.
If we invaded them without china's blessing, and we pulled another Macarthur and pushed them to the Chinese border and then pushed more (like he wanted to do before Truman fired his ass for insubordination), it would likely ignite a larger conflict with our biggest trade partner that holds (literally) trillions of our debt.