Access to and from the sea for landlocked states has been a long-standing issue in the law of the sea. Such issue is also addressed by the Convention on the Legal Status of the Caspian Sea (or Aktau Convention), which foresees a right of free access to other seas for landlocked State Parties—Azerbaijan, Kazakhstan, and Turkmenistan—through the Russian Federation. At the same time, it upholds the transit state's sovereignty and right to protect its legitimate interests. Consequently, it is important to assess the limits of the transit state's discretion pursuant to the Aktau Convention. In this regard, that instrument has important linkages with UNCLOS and with general international law. These linkages introduce in the Aktau Convention various norms—such as due regard and reasonableness—that play an important role in its interpretation.
