The full-scale invasion of Ukraine by the Russian Federation opened a new, dangerous era in international relations. Russia’s aggression opened a Pandora’s box and created a dangerous precedent for many other sleeping conflicts globally, including those in the Middle East and Asia. Therefore, new approaches to peacekeeping need to be developed, based on previous experience in conflict resolution. This paper will examine approaches to resolving the Russian-Ukrainian war, and possible peace agreements between Ukraine and Russia, based on experience from the Balkan wars and the Nagorno-Karabakh conflict. Finally, the article will elaborate on the role of justice and accountability in conflict resolution in the quest to secure peace and security in Ukraine and globally.