Both sides would be wise to give all the disputed territories the right to self determination in 2075, feeze temp borders for the next 50 years along current battle lines, and let any refugees with claims to being on either side go through migration and naturalization process starting in the 2030s.
But its these 2 countries that have to make the deal. We can be mediators. But we must not be meddlers.
Freeze, not feeze. Its hard to type accurately on my phone