China abstained from sanctions for years. But we also have to be realistic. The United States is still the most dominant country in the world on all fronts and the US is heavily controlled by an Israeli puppet master who's eager to see Iran destroyed. Both China and Iran must be cognizant of this and should choose to avoid confrontation if at all possible for the foreseeable future. At least until the US/China strength disparity has decreased.
And ask yourself, how much have Chinese sanctions really hurt Iran? Very little, if at all, I'd wager. Chinese sanctions have been mostly for show and after a few years and depending on the prevailing political climate, the sanctions will be quietly done away with.
You may ask how this is in anyway beneficial to Iran? Well, if you give the US, bully as it is, some kind of hollow victory, it will be less likely to react violently. Imagine if the US couldn't push sanctions through? They'd look weak and a military option where they bomb or invade to re-assert control would look increasingly attractive. Whenever the US feels slighted, innocent people die.
