By EUobserver

Turkey has signed a deal to buy €2bn of Russian S-400 anti-aircraft missiles instead of Western-made alternatives in a snub to Nato allies. Recep Tayyip Erdogan, the Turkish leader, had complained that the alternatives were too expensive. The deal also comes amid a Turkish-US dispute over the extradition from the US of Erdogan's political nemesis - Islamic guru Fethullah Gulen - and a Turkey-EU dispute over Erdogan's human rights abuses.