sentences:  Following a reportedly tense May 7 OSCE Minsk Group-mediated peace summit between Armenian President Sargsyan and Azerbaijani President Aliyev at the residence of the US Ambassador in Prague, on the sidelines of the EU's Eastern Partnership conference, which resulted in “no serious progress” Turkish President Gül met separately with the two leaders to propose four-way talks on the conflict to include Russia when they next met at the St. Petersburg Economic Forum in July.Turkish Prime Minister Erdoğan confirmed during a live 9 May TRT broadcast that no problem exists in bilateral relations between Turkey and Azerbaijan and that the provisional roadmap with Armenia was tied to resolution of the Nagorno-Karabakh conflict