Japan and South Korea decry North Korean missile launch . NEW : China regrets launch and urges calm . Beijing emerges as having most control over North Korea . ` From China 's perspective it has very little interest or need to come down very hard on North Korea until the U.S , Japan and South Korea make it clear to China that allowing North Korea to do this is going to be more costly than cracking down on them , '' said Dean Cheng , research fellow in Chinese Political and Security Affairs at the Heritage Foundation . How China responds to new initiatives will be key .
Japan and South Korea decry North Korean missile launch . NEW : China regrets launch and urges calm . Beijing emerges as having most control over North Korea . How China responds to new initiatives will be key .