hehehe, this may be quite controversial.
If i am not wrong, in 20 years or even longer, the expansion of China will not change the power of Russia in the Far East. This is due to the fact that China will in the short run, seek assistance from Russia in many aspects. To either China or Japan, Russia is not a reliable friend( but to Japan, I think USA is a good mate). Russia will find a balance between China and USA, just like 60 years ago, it gained benefit from the War between China and Japan. Don't expect Russia clashes with China in the short term.
So what is the current attitude towards Japan in China?
I have stressed it in my first post here in this forum, Anti-Japanese sentiment is overwhelmingly Strong in China, especially in Universities.
Even huge amounts of people advocate boycott of Japanese product.
( i know it's ridculous, but most Chinese can not accept the event of orgy in ZHU HAI, and the latest event of the performeance of 3 Japanese students in XI 'AN)
The relation between china and Japan is too complicated...
All the Anti- Japanese action is self- motivated and not controlled by Chinese authority. Consequently, it puts Chinese government to an emarrassing position, that it has to follow the steps of THOSE CHINESE EXTREMISTS( in chinese, we called them ツキテ淌??).
If Japan claims on attempting to develop Nuclear Weapons, China and Korea will be upset.
In the ultimate analysis, if Japan thinks its current position--- under American military umbrella is a disgrace. ( I think economically it is a good deal, and overall it is quite desirable to keep this relation with Americans). It will be destructive and tragic to Japan.