Why use a nuke when you could probably hit it with an M203 and watch it fall apart.A nuclear strike on 3GD would also fuck America's western coast and most of China's neighbors so it's not as easy as you think for the US to gain approval to perform such a strike. Doing so would get the US sanctioned to hell and back literally the next day.
Plus, if China tries an EMP, jokes on them.
There's so much lead paint on the walls in military installations that nothing would happen.
LEAD PAINT MASTER RACE!