Okay, so... explain to me how Russia and/or China plans to to destroy an E-6 stationed in Nebraska before a second-strike is launched by the USA.
It takes something like 20 minutes for a missile traveling at Mach 20, launched in Russia, before it reaches Nebraska. And the whole world will know that an ICBM was launched because those things aren't exactly subtle.
And once you figure out how to kill the one in Nebraska, then you have to tell me how you kill the one in Kentucky. I guess you launch both missiles simultaneously, but... I'm sure you can see where this is going. You're gonna have to launch hundreds of ICBMs simultaneously, and then wait 20 minutes, and then hope the entirety of the USA's defense is caught sleeping on their job for 20 minutes.