When Russian president Vladimir Putin walked shoulder to shoulder with Chinese president Xi Jinping on Wednesday, a hot mic caught them discussing organ transplants and the possibility that humans could live to 150 years old. The moment came as Mr Putin and Mr Xi walked with North Korea's Kim Jong Un at the head of a delegation of more than two dozen foreign leaders to view a military parade in Beijing marking the 80th anniversary of the end of the Second World War. The moment was carried on