tokyo u.s. vice president mike pence japanese prime minister shinzo abe agree tuesday two countries need persuade china play large role deal north korea japanese government spokesman say two confirm work lunch china role important deal north korea need work china take big role japanese deputy chief cabinet secretary koichi hagiuda tell reporters north korea conduct series ballistic missile launch recent months defiance u.n. sanction concern grow reclusive state could soon conduct sixth nuclear test u.s. aircraft carrier group steam area show force fear confrontation rise u.s. japan agree china play large role north korea