Chinese government's official position is neutrality. From a strategic standpoint there is no way they would assist Western Sanction of Russia. They would trade with Russia as usual with anything that is not weapon (but not including those that could be weaponized). In a way, China not selling weapon to Russia is already a big help to Ukriane.
Due to anti-US sentiment, there is a lot of Chinese netizen in Weibo and Bilibili supporting Russia and the sentiment that the Euromaiden in 2014 is a CIA-backed coup. However, if you go to ZhiHu and other Chinese Social Media or website, you can see lots of pro-Ukraine, anti-Russia voices too. These posts exists and have existed for a while, and the state censor did nothing.
But you won't see any major public figure publicly support Russia's war (just promoting Russian culture and scenery in Russia doesn't count) or denouce it and support Ukriane. All public figure must obey the Party Line, which is neutrality.