This war threatens to continue indefinitely and casualties will continue to mount. There is no sign of either side seeking a cease-fire: Ukraine because it aims to take back lost territory and remain independent, and Russia because Putin and his supporters yearn for a return of the situation when Russia dominated all the countries of eastern Europe.
But there is a solution. Both countries need to agree to the creation of a buffer state between them. The buffer state would comprise the eastern part of Ukraine – Donbas and Crimea, and an adjacent part of Russia. The integrity of this zone would be guaranteed by both countries and be managed by the United Nations, including supplying an international police force. The zone would be free of armaments. Citizens of both countries would have free access to the zone without the need for passports.