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 is suspected on going against their discussions
( z1 suspect :ARG1 ( z2 oppose :ARG0 ( z3 country :name ( z4 name :op "North" :op "Korea" ) ) :ARG1 ( z5 discuss :ARG0 z3 ) ) :ARG2 z3 )