President of Turkey Abdullah Gul (2ndL) speaks at the Guildhall in London, on November 23, 2011, as his wife, Hayrunnisa (R), the Lord Mayor of the City of London David Wootton (2ndR) and Princess Michael of Kent (L) listen during a State Banquet in his honour. Syria has reached a &#39;point of no return&#39; as the regime steps up violence against pro-democracy demonstrators, Turkish President Abdullah Gul warned in a speech earlier today.