In a May 7, 2010 report that was among the first-and most controversial-anywhere to dissect the South Korea-US verdict on the sinking of the South Korean warship Cheonan, Tanaka Sakai posed compelling questions about the official claims. The present article looks forward rather than back to assess possible regional and global ramifications of the Cheonan Incident for emerging power relations in the Asia-Pacific. Tanaka argues that, together with the failure to resolve the issue of the transfer of the Futenma base that is at the heart of the impasse in the US-Japan-Okinawa relationship, the stalemate over the Cheonan Incident illustrates the multipolarization of power that is part of the decline of American power and a redefinition of power relations in the Pacific consequent on China's rise. –Mark Selden