1、JUNE 2025Norms in New Technological DomainsWhats Next for Japan and the United States in CyberspaceBy Koichiro KomiyamaThis report is part of Strategic Japan,a CSIS Japan Chair initiative featuring analysis by Japans leading foreign policy scholars on key regional and global challenges and the impli
2、cations for the U.S.-Japan alliance.IntroductionCybersecurity and national security have become inseparably intertwined in recent years.Once regarded as a global commonsan open and interconnected frontiercyberspace has rapidly been reframed both as the fifth domain of warfare(the other four being la
3、nd,sea,air,and outer space)and as the front line of great power competition.In addition,cyberspace has proven to be far more centralized than many initially believed.It is a space where just eight providers generate 65 percent of all internet traffic.A triadic competitionspecifically,the contest amo
4、ng democracies,authoritarian states,and big tech companiesconstantly arranges(and rearranges)cyberspace.In February 2025,Japanese Prime Minister Shigeru Ishiba visited Washington,D.C.,and held a summit meeting with President Trump.On that occasion,the two leaders issued a joint statement,declaring t
