No one has a clue who/what has entered this country, via much simpler means than wading water at the border. In some ways that border issue is being used as a ruse.
Back in the cold war, everybody had things setup well in advance for if it went hot, their sleeper agents were ready to start taking down critical infrastructure and such. Supplies stockpiled etc.
I highly doubt the Chinese don't have a huge amount of that stuff in place right here and now.
The Russians probably still have plenty of stuff but the Chinese have had almost unlimited access to every level of our country, government, industry and education for a couple decades.
Also if you think about how much stuff especially electronics is made in China.
Would the Chinese act any different than our own government?
The CIA was pretty much totally busted for making just about all the tech coming out of the USA filled with backdoors or controls.
Wouldn't the Chinese do the same?
For a long time keeping the Chinese and the Russians against each other was a thing.
Now the NWO and the US government pretty much forced the Russians and the Chinese into a near marriage of necessity.
Then of course all the random foot soldiers of middle eastern types with serious hate over historical events, just sitting around waiting for someone to hand them a couple crates and tell them to go make Allah proud. Why risk your own agents and sleepers when you can hand some tools to fanatics and tell them to have fun.
How hard would it be for someone to get the 13% all whipped up into flash mobs by using messages pushed by their phones saying some "grand injustice of whitey" and "go get you some street justice and reparations".