[quotemsg=21096177,0,1696401]You are thinking of the Tianhe-2 which used Intel chips and topped the supercomputer list in 2014. As a result, in 2015, the US Government banned Intel, NVidia, and AMD from selling chips to China for use in supercomputers.[/quotemsg]
No, the ban wasn't simply because China built the Tianhe-2. Rather, it was for non-public reasons probably relating to hacking or maybe IP theft.
Such bans are sanctions of last-resort, since it just gets China to accelerate development of its own technology. Then, not only do you lose the option of doing it again, but now there's another Chinese competitor to a US company and... oh, look - your trade deficit just got bigger!
[quotemsg=21096177,0,1696401]Less than two years later, China had created the Sunway TaihuLight that is much faster[/quotemsg]
Fortunately, it's also much less general than if it had used off-the-shelf CPUs and GPUs. So, I'd say it's only faster on paper. But that's enough to make their point.