Illinois Law professor Lesley M. Wexler examines recent U.S. policy shifts under the Biden administration regarding the authorization of cluster munitions (ATACMS) and anti-personnel landmines for use in Ukraine, along with their implications for international humanitarian law. Professor Wexler argues that these reversals, particularly the facilitation of Ukraine’s violation of the Landmine Ban Treaty, represent a concerning erosion of international humanitarian law norms and treaties, warning that such case-by-case justifications could lead to a broader collapse of civilian protection standards in warfare.