Here's something to correct your own ignorance.
Earlier this year in 2018, the National Science Foundation reported to Congress that it expects Chinese R&D spending to exceed that of the USA, in the Year 2019
So it is now perfectly plausible to expect China to come up with technological breakthroughs.
And going forward, that should become the default assumption given China's higher R&D spending, which is also growing much faster.
Ignorance is bliss, isn't it?
I would be a bit cautious with such predictions. R&D is much like military spending in that it is largest cumulative.
It can takes years or decades worth of R&D investment to allow the next big breakthrough.
Just because China is projected to spend more on R&D next year does not automatically mean China will suddenly gain the technological upperhand over night.
Also, it is a little simplistic to directly link R&D spending with advancements and breakthroughs. While there is indeed a strong correlation, it’s a hugely variable correlation where investments does not always yield fruits.
Also, in the context of weapons development, it is very rare for a single breakthrough to bring about revolutionary new weapons. Usually you need a vast number of breakthroughs in diverse fields to all be ready before you can bring something to market. One breakthrough may end up waiting ‘on the shelf’ for years or decades before another breakthrough allows it to be used.
This ties back to the earlier point about R&D being cumulative.