Who Is Kazakh Leader Nazarbaev's 'Secret Wife'?

Asel Qurmanbaeva was the beneficiary of a $30 million payment from an offshore company, according to evidence presented in the Pandora Papers published by an international team of investigative journalists. For years, there have been reports she was in a secret long-term relationship with former Kazakh President Nursultan Nazarbaev. So what do we know about her?