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If we can revitalize them with new avionics , with weapons capabilities , with upgraded wing and other structural parts that need to be put into these aircraft , we can keep them going for another thirty years . Here diplomatic and economic gains can be appreciated by the belligerent under the watchful eye of the coalition partners . Officials additionally have been known to manipulate the exit visa regime to prevent dissidents from leaving , or to expel " unwanted " residents , such as government critics and non-Turkmen . Finally Caspian States ( Azerbaijan , Iran , Kazakhstan , Russia and Turkmenistan ) have signed the first five-party agreement - framework Convention on Environmental Protection of Caspian Sea .