No contest, China is the biggest influence in the Asian region. I think them having the bigger population and having more mines than any other countries is enough to bolster the fact that China is the biggest influence to bitcoin even though they are now cracking down on mining, they still have the lingering influence.
Unfortunately, China is on its move on banning crypto services and mining within their territory. If only that was not the case, considering how powerful and how wealthy the nation is, they will surely be considered as the Asian country that has the greatest influence over bitcoin and other crypto as well. Regardless, the citizens of China will surely still find a way on how they can still access crypto as well as mine secretly which will make an impact still towards the market. Let us hope their decision will be stopped or be temporary only because they will be of good help to crypto if they would allow the regulation of it.