Cybersecurity is a global concern requiring international coordination with respect to nation-state attacks and data-driven cross-border transactions and investigations. International organizations, nation states, and academic commentators continue to call for specific cybersecurity international laws or treaties. But with a few exceptions, nation states are continuing to borrow from traditional frameworks. This results in imperfect analogies, causing uncertainty for nations, businesses and individuals. In this two-part guest article series, Hughes Hubbard attorneys Seth Rothman and Andreas Baum address the intersection of cybersecurity and international law. Part one provides insight into cyber warfare and the relevant laws and treaties that are being used to create a framework for this shifting threat. Part two will explore laws related to cyber crimes and international laws that regulate business activities. See also “Prosecuting Borderless Cyber Crime Through Proactive Law Enforcement and Private Sector Cooperation” (Mar. 2, 2016).