China is paying Russia about a bit more than $10 billion a year for that deal. Even if some of that money is going for weapons, the US is still doing much more in total arms sales than Russia.
I'm not sure why I bothered responding, because I'm sure you'll reply with something about how they are really paying much more than that under the table (even though no reputable news sources have reported on it).
It's clear to reasonable people that neither the USSR, nor Japan destroyed the US economy. China will not destroy the US economy either.
This fear of China is caused by inappropriately extrapolating current trends, i.e., China is growing at 7% per year, and this rate will continue unabated despite that fact that historically GDP growth rate always declines as a country becomes developed.
As to your earlier assertions about super computers, those numbers are close to meaningless.
The UAE has the world's tallest building, should we be afraid of that?
If the UK wanted to build the world's fastest super computer, they could. If the US wanted to we could. It's just a dick measuring contest that is primarily a function of how much money a country currently wants to spend on building them.
The only thing faster super computers prove is that they are simply worth more to China than they are to us. They are massively behind us in nuclear capability, so the ability to conduct simulated nuclear testing is more valuable to them. The PR win is also correspondingly more valuable to them.