US-China relations US Treasury Secretary Janet Yellen, in two days of meetings with officials and economists in Beijing, is trying to stabilize a rocky relationship that has deteriorated this week as China retaliated in a technology war with the United States. Here are four things that make it difficult to restore relations, and one thing that will save US-China relations. In a nutshell... 1. War of the chips.     Beijing has imposed export controls on two raw materials, gallium and germanium, which are critical to the global chip manufacturing industry. 2. Raids on US businesses   In April, Beijing updated the law on counterintelligence, expanding the list of activities that can be considered espionage. 3. Possible restrictions on investment in China 4. Risk reduction More from CNN sources CNN source