A photo of Chinese-American seismologist Chen Yulin (right), who has reportedly been detained in China for 20 months, and his wife Long Yufang, taken in Los Angeles, USA. /Reuters Yonhap News Reuters reported on the 13th (local time) that a Chinese American in his 50s who was researching the detection of North Korea's nuclear tests was detained in China for 20 months on suspicion of espionage. Ahead of Chinese President Xi Jinping's visit to the US this September, issues between the US, China...