Kim Jong Nam, left, half-brother of North Korea’s leader Kim Jong Un, in Narita, Japan, on May 4, 2001, and North Korean leader Kim Jong Un on May 9, 2016, in Pyongyang, North Korea. Source: AP Photos/Shizuo Kambayashi, Wong Maye-E BEIJING’s terse response last week that China has been closely monitoring developments in the Cold War-style assassination of Kim Jong-un’ estranged half brother will likely be the extent of its response to the matter.