1. End all of the sanctions and ensure the free flow of fuel, fertilizer, and food.
2. Have Ukraine cede Crimea to Russia.
3. Have Russia cede Odessa to Ukraine.
4. Limit all hostilities to Donbas and Mariupol, substantially reducing the geographical scope of the war, and pledge to work towards cessation of hostilities in those areas too.
Odessa is de facto and de jure part of Ukraine. Nothing for Russia to cede.
It would be like you saying Mexico should cede Boise Idaho....