Abu Dhabi Crown Prince Sheikh Mohammad bin Zayed Al-Nuhayyan held talks with visiting US Secretary of State John Kerry on regional and international developments.Sheikh Mohammad, also UAE's Deputy Supreme Commander of Armed Forces, and Kerry also discussed ongoing efforts to achieve peace and security in the region, official news agency (WAM) reported.The two men underlined that "serious dialogue and constructive understanding" would solve all crises in the region.They also discussed the humanitarian catastrophe in Syria and outcome of negotiations of the Geneva II conference, and the situation in Egypt.Sheikh Mohammad and Kerry the nuclear negotiations between Iran and the P5+1 group, which aimed at reaching a comprehensive agreement.