Water and food scarcity in the Middle East, as a consequence of the changing climate and its reliance on the global food supply chain (wheat imports), is IMO one of the most important contributors of political uproar that lead to the Arab Spring, particularly in Egypt.
Edit: possibly a better source describing some of the correlations between extreme climate events and recent global food shortages, and its adverse impact on Middle East and Northern Africa.
It's a major dispute. Turkey basically took advantage of the wars to reneg on previous agreements to allow water flow.