QINGDAO, China: Chinese President Xi Jinping on Saturday opened a regional security summit attended by Russia and Iran with boasts of the bloc’s "unity", just as a fractious G7 gathering was mired in divisions between Europe and the US.On the sidelines of the Shanghai Cooperation Organisation summit in the coastal Chinese city of Qingdao, Russian President Vladimir Putin met his Iranian counterpart Hassan Rouhani and expressed his support for Tehran joining the SCO.Rouhani, for his part,...