World leaders expressed concern on Thursday that North Korea will quit six-party nuclear disarmament talks and will  bolster its nuclear weapons arsenal.
North Korea already has nuclear weapons
( z1 have :ARG0 ( z2 country :name ( z3 name :op "North" :op "Korea" ) ) :ARG1 ( z4 weapon :mod ( z5 nucleus ) ) :time ( z6 already ) )