The Additional Protocol I to the 1949 Geneva Convention offers a model, but the United States can’t denounce Russia until it embraces the norms it’s seeking to enforce.
Ukraine’s Zaporizhzhia nuclear power complex, which Russia captured early in the war, has been continually in the European and U.S. headlines since Russia turned it into a military base from which it shelled Ukraine across the Dnipro River. Kyiv knows that Ukrainian forces will not fire back at a nuclear plant and risk a radiological release. It has been acutely sensitive to such risks since the horrific 1986 Chernobyl accident.