What are the possible mechanisms that can be used to settle territorial disputes between Ukraine and Russia should the hostilities cease?

What are the possible mechanisms that can be used to settle territorial disputes between Ukraine and Russia should the hostilities cease? I heard that most disputes are settled through bilateral meetings between the affected parties (Russia and Ukraine), but I am interested to hear if there exist some court or institutions that can facilitate the process or involve other parties such as China or the United States.

https://en.wikipedia.org/wiki/Philippines_v._China I know for a fact that UNCLOS was invoked to try to settle the disputes, but China simply rejected the decision, because UNCLOS had no power over China, so I am wondering if there's a more effective mechanism for dispute settlement involving territorial disputes.