beijing u.s. president donald trump ask china cut financial link north korea abide u.n. sanction meet chinese president xi jinping beijing senior white house official say wednesday trump arrive beijing wednesday afternoon south korea two-night stop chinese capital part marathon asia tour u.s. president undecided whether declare north korea state sponsor terrorism end trip official say speak reporters on-board air force one trump believe talk north would require reduce threats end provocations movement toward denuclearization deal achieve without denuclearisation official add trump ask china cut financial link north korea white house official