South Korea, Japan and the United States will coordinate sanctions and close gaps in the international sanctions regime against North Korea, Seoul's envoy for North Korea said on Tuesday. Kim Gunn, South Korea's Special Representative for Korean Peninsula Peace and Security Affairs, said at a meeting in the Indonesian capital Jakarta with his U.S. and Japanese counterparts that North Korea was "becoming more aggressive and blatant in its nuclear threat". "North Korea's further provocation will be met by a firm and united response from the international community," he said. The three countries this month imposed more sanctions on North Korean…