Here's Bloomberg's accounting of who's beholden to whom:
If Putin continues to advance in Ukraine, forcing a military confrontation or breakup of the country, he may well push China to take a stronger stand. The truth is that in material terms, China gains less than Russia does from their relationship. The latter accounts for a little more than 2 percent of China's external trade. While volumes are growing, in 2011 China got only about 6 percent of its imported oil from Russia.
And here Bloomberg's editors tell of how Russia is playing in other sandboxes as well:
And though China is Russia's largest trading partner, Putin has also been hedging his bets. He has sought to expand rail links, pipelines and energy exports not just to China but also to both Koreas and to China's archrival Japan. Russia is aiming to sell sophisticated weaponry to India, and has deepened economic and military relations with Vietnam.
So will Russia, for all its courting, garner international support for a continued advance in Ukraine? Well, think of it this way: if there's one thing China, South Korea, Japan and India have in common, it's that they're all beholden to the economies of the U.S. and the European Union, and vice versa.
Not that it can't happen, but clearly, the more Russia looks to expand its economic interests, the less stomach it'll have for war...