A signitory yes, but not a party to the conflict. Russia denied being that, and under point 10 they denied having any forces inside Ukraine so could not be asked to withdraw.
Schrödinger's party if you will; not there for any responsibility, there to claim foul play when the other guys refuse to play along with your charade.
At best you could argue that none of the parties adhered to the agreement, but regardless the full scale invasion of a neighbouring country, the rape and wanton murder perpetrated by the VDV/capitalist murder brigades under Prigozhin, the kidnapping and forced relocation of the Ukrainian children in occupied territories and let's not forget threats of all out nuclear war is so far beyond any perceived slight under the Minsk agreement that any reference to it is just comical at this point.
Whether it's China or really anything, I'd agree to being critical of any claims made without proper context, yet the context here is the massacre and subsequent cover-up perpetrated by the Chinese government following peaceful protests on the Tiananmen square.
Meeting that with whataboutisms and vague excuses is disrespectful towards the victims full stop.
Being a socialist should be easy, because truth is on our side. It should be easy to point to Tiananmen square and say "this is what happens when the ruling class feels threatened", just like you can say the same thing when the US government busts their unions or murders their black citizens. Being an unquestioning supporter of either of these regimes is not what socialism is to me, and it never was. I just don't understand how anyone can reconcile these opposing views in their heads.