in the 80's the US needed titanium to build their new strategic bombers, the F117 Nighthawk
At this time, Russia was the only provider that could sell enough titanium for USA's needs.
only problem was, soviet Russia banned the US because it was a strategic ressource
solution was simple : the CIA created a lot of fake companies around the world. each ordered reasonable amounts of titanium, wich was shipped back to the US.
it was in the 80's. now it's even simpler. China can order everything they want. it's just more complicated than a regular order but it can be done.
Also, on aliexpress, i can see TONs of used Ryzen / i7 CPUs , so they have all the hardware they want, no problem