The North Korean military detonated its second nuclear test in May 2009 close to the Chinese border , and the blast set off an earthquake of magnitude 4.5 with an epicenter only from Yanji . The mutual goodwill of the Chinese and Korean populations in the region was put under severe strain , and many in Yanji expressed newfound feelings of dismay and insecurity regarding their North Korean neighbors
second nuclear test
2009 North Korean nuclear test
Yanji