Singapore PM Lee to step down on May 15 and hand power to his deputyExhibition unveils rare masterpiece by ancient Chinese artistHamas chief reaffirms commitment to ceasefire demandsRussia ready for dialogue with Ukraine: KremlinGreek athletes excited to attend Chengdu UniversiadeLian and Yang win China's 7th diving gold at swimming worldsUN suspends nightNation's rich cultural heritage continues to captivateOPEC chief stresses energy cooperation with ChinaGlamorous ex