Pyongyang has threatened to cancel the talks if Washington continues to press for its unilateral nuclear disarmament.
朝鲜威胁称如果美方继续强求朝鲜单方核裁军，则将取消会晤。
英语百科
Unilateral disarmament
Unilateral disarmament is a policy option, to renounce weapons without seeking equivalent concessions from one's actual or potential rivals. It was most commonly used in the twentieth century in the context of unilateral nuclear disarmament, a recurrent objective of peace movements in countries such as the USA and the UK.