Is Wagner chief Yevgeny Prigozhin's death an act of revenge by Vladimir Putin? Was it a crash or a sabotage? Is it a staged drama to help Prigozhin disappear? There are many unanswered questions after Russia confirmed that Wagner mercenary chief Yevgeny Prigozhin died when a private jet crashed north of the capital, Moscow. NDTV's Parmeshwar Bawa reports.