Turkmenistan expressed anger Wednesday at the lack of an agreement on dividing the oil-rich Caspian Sea, threatening to take the issue to the U.N. if the five countries on the inland sea don\'t reach a deal soon. The Caspian is believed to contain the third-largest energy reserves in the world, but its legal status has been in limbo since the 1991 Soviet collapse. Talks among shoreline nations Russia, Iran, Turkmenistan, Kazakhstan and Azerbaijan on its division have dragged on for years. The drawn-out process fosters \"mutual accusations, arguments and conflicts\" among the shoreline nations, Turkmenistan\'s Foreign Ministry said in a statement, adding that the solution is to turn to international organizations and courts to resolve the problems. \"If the negotiations among the sides do not lead to mutually acceptable decisions, it will be necessary to appeal to international organizations, including the United Nations,\" the ministry statement said. The statement followed media reports quoting officials of Azerbaijan\'s state oil company as saying that Azerbaijan will not allow Turkmenistan to begin developing a disputed oil field that it wants to develop with a Canadian company, Buried Hill Energy. The field -called Serdar by Turkmenistan and Kyapaz by Azerbaijan -is on territory claimed by both ex-Soviet republics. Turkmenistan and Azerbaijan had planned to hold bilateral talks on the status of the Caspian late last year, but they were called doff. (AP)