Coercion is a tactic that has had success. Not with Iran or North Korea in recent times, but it can be readily forgotten that pressure via sanctions worked to help eliminate Libya’s missile development program. Even so, that achievement was qualified – any country that reaches a certain point in the development of a weapons program will continue to have to have the technological know-how to resurrect it in the future. Establishing trust remains a sticking point. And as North Korea has demonstrated through various claims to be developing a space program, the dual-use prospects of research into rockets can be a guise used to develop missile capabilities.
Forging agreement for partial limitation of missile capabilities is another opportunity, if not for disarmament, at least for limiting the potential escalation. Saudi Arabia, for example, purchased Chinese-made nuclear capable DF-21 ballistic missiles in a modified version that reportedly limited them to carrying conventional warheads. Riyadh and Beijing are said to have continued missile development.
A further option is technological. “Defence by denial” weapons systems could devalue the deterrent capability of offensive weapon capabilities. The jargon might be dense, but a layered missile defence system with credible multiple kill vehicles (MKV) or multiple object kill vehicles (MOKVs) that could destroy Multiple Re-entry Vehicles (MRVs) and Multiple Independently Targetable Re-entry Vehicles (MIRVs) can rob the teeth of a rival system. In other words, the aim is to neuter the missile threat – but, of course, relying on such technological advancements carries its own risks, with missiles developed with survivability mechanisms.
And when it comes to forging an agreed reduction in missile capabilities via diplomacy, there are always the complexities of verification. Countries tend to only enter an arms control process when they have deterrent capability to replace the present capability built up. The United States, for instance, gave up on ground-launched cruise missiles in the Intermediate Range Nuclear Forces (INF) Treaty, but maintained the sea-launched cruise missile capability.
Arms control measures can foster trust. Such agreements can even reduce the quantitative and qualitative advantage of particular weapons systems. Establishing peace zones and agreeing to follow a policy to “induct only” by replacing old missiles with new missiles can help, keeping in mind that new missiles can be more capable than the missiles replaced.