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.
Nations do not often choose to dismantle their entire military capability. Unilateral disarmaments are usually sought in one technical competency, such as Weapons of Mass Destruction. Non-violent political movements from that of Mahatma Gandhi to the Campaign for Nuclear Disarmament have recommended unilateral disarmament as a simple step toward world peace.