Really? I wouldn't say it's "impression", I rather think that it's just a "wishful-thinking". China doesn't care where exactly will be the border between Russia and Europe - at Don, at Dniepr, at Zbruch or at Visla. What is even more important, China isn't interested in the saving of European anti-Russian leverage somewhere in the West, they are rather interested in the reliable peace (i.e. peace without Ukraine) in Europe for both economical reasons (with the Russians tanks in the former Poland and Germany the remains of the EU will be more interested in the trading with China and Russia) and political ones (together Russia and China can more or less easily solve the problems of Taiwan separatists and Japan militarists).
You see, Russia didn't care much about 'offers' from both EU and the USA. We can't care less about Chinese, Indian, Nigerian or Korean offers. Russia can agree with the existence of demilitarised, denazificated and truly neutral Ukraine. Russia won't agree with the existence of anti-Russian Ukraine, NATO or not NATO, Shanghai block or not Shanghai block. It's that simple. They can join us and help us, and then they'll be rewarded, or they can stay on other way, and then they'll be punished. They are smart guys those Chinamen, and they already made the right choice.