International political discussions have intensified over a possible meeting involving US President Donald Trump, Chinese President Xi Jinping and Russian President Vladimir Putin. The White House announced on Friday that the three leaders could meet on the sidelines of the Asia-Pacific Economic Cooperation (APEC) summit in Shenzhen, China, later this week.For the first time, the heads of state of the world’s three largest nuclear-armed countries are expected to sit together to discuss preventin...