osaka japan ethnic koreans live japan nervously watch grow tensions north korea wary possible backlash community pyongyang ramp sabre-rattling public antipathy towards koreans appear escalate reaction north late nuclear test missile launch community target abuse japanese nationalists similar incidents past north conduct powerful nuclear test ever last week late august fire ballistic missile hokkaido northern japan new show force western japanese city osaka home country large population ethnic koreans will talk publicly north korea mix view pyongyang action pu kyon ja owner store sell korean traditional clothe second-generation korean resident japan say felt north pursuit nuclear weapons natural reaction threats unite state say loudly secretly think well do north korea development missile nuclear capabilities say north korea great pressure international society believe end watch current situation great hope add hand chung kap-su another second-generation korean town say hop north korea stop provocations pursue peaceful path seek dialogue south korea north korea defeat unite state hope change way 453,096 south koreans 32,461 north koreans live japan last year accord government data many force move japan occupation korean peninsula world war two japan pass anti-hate law last year may discourage fresh act abuse community issue still bear watch say moon gyeong-su professor ethnic korean study ritsumeikan university kyoto north korea launch missile conduct nuclear test example korean school easy target bully accusations japan add koreans japan wary tensions north worry backlash