Vladimir Putin has launched a series of drone and missile attacks on Ukraine’s energy infrastructure in response to an Oct. 8 bridge bombing that damaged Russian supply lines. These attacks have left many Ukrainians without heat and electricity during the darkest and coldest period of the year.

CERL Advisory Council member Mary Ellen O’Connell spoke with AP News about the matter.

Mary Ellen O’Connell is the Robert and Marion Short Professor of Law and Research Professor of International Dispute Resolution—Kroc Institute for International Peace Studies, University of Notre Dame. Her work is in the areas of international law on the use of force, international dispute resolution, and international legal theory. Read her full bio here.