SOFIA- Relations between Turkey and the European Union have progressed 'a great deal' since a recent summit between Ankara and Brussels, Turkish Prime Minister Ahmet Davutoglu said on Tuesday. 'Following the last EU-Turkey summit, relations with the EU have accelerated a great deal. A new chapter has been opened after nearly four years,' Davutoglu told reporters in Sofia at a joint news conference with his Bulgarian counterpart. The EU on Monday revived Turkey's membership bid, opening negotiations on a new 'chapter', or rules, as part of a bigger deal to help Europe solve its migration crisis.