
https://www.crisisgroup.org/europe-central-asia/eastern-europe/ukraine/260-peace-ukraine-ii-new-approach-disengagement

https://www.crisisgroup.org/europe-central-asia/eastern-europe/ukraine/261-peace-ukraine-iii-costs-war-donbas

https://www.brookings.edu/articles/can-sanctions-change-the-course-of-conflict/