Japan and South Korea decry North Korean rocket launch . The United States has warned that the missile could be a cover for an intercontinental ballistic missile. China regrets launch and urges calm . Beijing seen as having most leverage over North Korea . How China responds to new initiatives will be key .
Japan and South Korea decry North Korean rocket launch . NEW : China regrets launch and urges calm . Beijing seen as having most leverage over North Korea . How China responds to new initiatives will be key .