Chinese officials have been pushing to restart high-level trilateral talks between China, Japan and South Korea, which have withered in recent years. The three countries’ armed forces are working together again. The American, Japanese and South Korean defence ministers met in June and pledged to begin sharing intelligence about North Korean missile launches in real time. Closer co-ordination between the three sends a signal to North Korea and other would-be belligerents that if “we are attacked, we can deal with the situation”, says Wi Sung-lac, a former South Korean diplomat and nuclear negotiator. The summit will focus on deeper defence ties. Technology and supply chains for energy and semiconductors will also be on the agenda. The leaders will probably issue a joint declaration laying out their shared interests in military and economic security. These days China’s assertiveness, North Korea’s belligerence and Russian aggression are bringing the three closer. The governments’ strategic visions have never been this closely aligned, is America mobilizing its allies to fight China, North Korea and Russia ?