State-region relations involve negotiations over the power to (re)constitute local spaces. While in federal states, power-sharing ostensibly gives regions a role over many space-making decisions, power asymmetries affect this role. Where centralization trends may erode regional agency, law can provide an important tool by which regions can assert influence. We examine a case where, in response to a proposed Russian federal law highly unpopular with a regional population, the region's government sought to ameliorate its potential impacts by using opportunities to coproduce the law, amending regional legislation, and strategically implementing other federal and regional laws to protect its territory.