The relationship between China and the United States has soured to such an extent that even think tanks from each side are unable to engage bilaterally, but Singapore can play a role in bringing the rival superpowers together, veteran diplomat Tommy Koh has said.At a Singapore International Mediation Centre fireside chat on Wednesday, Koh, who was the city state’s former ambassador to the UN and Washington, noted Singapore had previously – as host – brought to the table territories with...