I didn't eve know this until I was reading about this morning's news on Uber and Grab. This happened in November and completed in January. Uber and Yandex joint venture. You can use either of their apps in Russia to order cars.
"Uber Technologies Inc. agreed in July to merge its operations in Russia and neighboring ex-Soviet republics into a joint venture, 59.3 percent owned by Yandex and 36.6 percent by Uber. This became the San Francisco-based company’s second retreat from a major market after it ceded China last year in exchange for a minority stake in rival Didi Chuxing.
The merger is expected to be completed in January 2018. After the closing of the transaction, consumers will be able to use both the Yandex.Taxi and Uber apps to book rides, while the driver-side applications will be integrated so they’re able to accept bookings from either service.