State-of-the-art chip fabrication is still mostly based in Taiwan, with TSMC (as an example: the BR100, China's most recent native flagship gpu, is fabbed using TSMC) - China's own SMIC has appeared to struggle
However, they seem to have been catching up fairly quickly - until very recently SMIC have been stuck around 14nm (state of the art in 2013, SMIC in 2019), but they recently announced they have managed to start producing 7nm chips (state of the art in 2018)
However, they seem to have been catching up fairly quickly - until very recently SMIC have been stuck around 14nm (state of the art in 2013, SMIC in 2019), but they recently announced they have managed to start producing 7nm chips (state of the art in 2018)