 Yandex NV NASDAQ: YNDX has appointed former X5 Retail Group CFO Svetlana Demyashkevich as Yandexs CFO and Vadim Marchuk as COO, effective from June 1. On March 30, Yandex announced that Greg Abovsky would depart as CFO and COO effective April 30 to pursue a new opportunity in another geography. 