They aren't releasing it in China either.
Yet. But they are probably working with Chinese partners (including the government) on releasing something (maybe with Alibaba models instead of Google models, on a Chinese-local cloud rather than google cloud).
A quick check showed it is estimated that Apple gets about 18% of it's profits from China but only maybe 7% from EU countries (ignore Apple's definition of Europe!).
Maybe China is easier to work with - perhaps their rules are made clearer?
China has 1.4 billion people and they are rapidly increasing their wealth. The only surprising factor is that Chinese cell phone producers haven't eaten up apple's marketshare yet.
And they are framing the completely different in that case.