tokyo u.s. president donald trump japanese prime minister shinzo abe agree telephone conversation wednesday pressure maintain north korea senior japanese government official tell reporters two men also agree dialogue purpose dialogue meaningless official say recent weeks north korea launch two missiles japan conduct sixth nuclear test may fast advance toward goal develop nuclear-tipped missile capable hit u.s. mainland u.s. secretary state rex tillerson say last weekend washington directly communicate pyongyang nuclear missile program pyongyang show interest dialogue trump late dismiss prospect talk north korea waste time 12-minute telephone conversation abe also offer condolences mass shoot las vegas tell trump japan 100 percent behind american people trump travel japan china south korea vietnam philippines next month trump japan 's abe agree keep pressure north korea