unite state china target finance hongxiang industrial chinese company head communist party cadre obama administration think role assist north korea nuclear program wall street journal report monday police liaoning northeastern border province china start probe firm 's allege long-term involvement `` serious economic crimes `` course trade activities paper report on.wsj.com/2cz8iu1 certain assets relate company founder top executive xiaohong relatives associate freeze chinese authorities recent weeks accord government corporate file cite report u.s. department justice prosecutors visit beijing twice last month make chinese counterparts aware allege criminal activities commit hongxiang industrials say justice department prepare early week announce legal action chinese firm suspect provide financial assistance pyongyang journal report cite officials familiar matter u.s. president barack obama chinese premier li keqiang agree monday step cooperation unite nations security council law-enforcement channel north korea fifth nuclear test white house say u.s. congress pass legislation year would sanction anyone engage facilitate contribute north korea proliferation weapons mass destruction representatives u.s. department justice chinese government hongxiang industrial unavailable immediate comment u.s. china target chinese firm suspect north korean nuclear link wsj