Kelly Greenhill has identified how states may employ 'weapons of mass migration' against target states in their foreign relations. Migration diplomacy may involve the use of refugees, labor migrants, or diasporas in states' pursuit of international diplomacy goals. In the context of the Syrian Civil War, Syrian refugees were used in the context of Jordanian, Lebanese, and Turkish migration diplomacy. Nuclear Nuclear diplomacy is the area of diplomacy related to preventing nuclear proliferation and nuclear war. One of the most well-known (and most controversial) philosophies of nuclear diplomacy is mutually assured destruction (MAD). Preventive Preventive diplomacy is carried out through quiet means (as opposed to "gun-boat diplomacy", which is backed by the threat of force, or "public diplomacy", which makes use of publicity). It is also understood that circumstances may exist in which the consensual use of force (notably preventive deployment) might be welcomed by parties to a conflict with a view to achieving the stabilization necessary for diplomacy and related political processes to proceed. This is to be distinguished from the use of "persuasion", "suasion", "influence", and other non-coercive approaches explored below. Preventive diplomacy, in the view of one expert, is "the range of peaceful dispute resolution approaches mentioned in Article 33 of the UN Charter [on the pacific settlement of disputes] when applied before a dispute crosses the threshold to armed conflict." It may take many forms, with different means employed. One form of diplomacy which may be brought to bear to prevent violent conflict (or to prevent its recurrence) is "quiet diplomacy". When one speaks of the practice of quiet diplomacy, definitional clarity is largely absent. In part this is due to a lack of any comprehensive assessment of exactly what types of engagement qualify, and how such engagements are pursued. On the one hand, a survey of the literature reveals no precise understanding or terminology on the subject. On the other hand, concepts are neither clear nor discrete in practice. Multiple definitions are often invoked simultaneously by theorists, and the activities themselves often mix and overlap in practice. Public Public diplomacy is the exercise of influence through communication with the general public in another nation, rather than attempting to influence the nation's government directly. This communication may take the form of propaganda, or more benign forms such as citizen diplomacy, individual interactions between average citizens of two or more nations. Technological advances and the advent of