Kazakhstan's influential former president Nursultan Nazarbayev has self-isolated after testing positive for COVID-19, his spokesman Aidos Ukibay wrote on Twitter.
"There is no reason for concern," Ukibay wrote, referring to the health of 79-year-old Nazarbayev, who retains sweeping powers as Yelbasy, or national leader, and chair of the oil-rich nation's security council.