Five nations surrounding the Caspian Sea have signed a landmark deal on how to legally divide it up. <br /> The leaders of Russia, Iran, Azerbaijan, Kazakhstan and Turkmenistan signed the agreement in the Kazakh city of Aktau on Sunday.<br />It seeks to resolve more than two decades of regional tensions by creating a formula to divide resources and preventing a military presence around the sea. <br />Another contentious issue was whether or not, despite its name, the Caspian Sea was a sea or a lake.<br />If it's a sea, then each nation gets a share of resources in proportion to the shoreline, but a lake would mean an equal split between the states. <br />In Sunday's deal, the leaders agreed to assume it was both, but did not yet agree on who gets what. <br />
