Exactly. As Wang Wenbin said, to steal then give back part of what is stolen is still theft. EU owes China, not the other way around. It has to prove good will and reverse all their damaging accusations and bans on China, plus compensation for damages, before China will stake political and diplomatic capital on even asking Russia and Ukraine for a mediation.Those are not concessions in China's view point.
EU and China relationship has been deteriorating long before Ukrainian crisis. The loss of CAI and Huawei issue is China's loss to name a few. These losses have to be returned regardless what China may do to Ukraine crisis.
So EU may be willing to "give", China is not interested in receiving what is always China's belonging as a goodwill. This is similar to Meng Wanzhou's case. Meng would not and China would not accept her release as a "criminal", only total discharge of the accusation without confession is acceptable. China is willing to take the cost of EU's possible aggression.
EU got itself in the shit hole by antagonizing China then jump on the war wagon of US, they have to pay back first before asking for help.
China isn't the one in a rush here, they are the ones whose gas, oil, resources and fertilizer got cut off. They're the ones who don't want an failed state on their borders. They complained about refugees from Yugoslavia before and that was a country of a few million people so they aren't ready for Ukraine.