September 23, 2015. President Vladimir Putin, third right, at the ceremonial opening of the Moscow Cathedral Mosque, Europe's largest mosque, after renovation. From right: President of Palestine Mahmoud Abbas and Ravil Gainutdin, Chairman of the Russian Mufti Council. From left: Moscow Mayor Sergei Sobyanin, businessman Suleiman Kerimov and President of Turkey Recep Tayyip Erdogan.