The leading Russian search engine company Yandex has begun offering Real Time Bidding (RTB). That includes behavioral re-targeting. For now, display (banner) ads with re-retargeting settings can be displayed on partner sites of Yandex Advertising Network, incluing geo-targeting options.
When a user visits a website with a display ad within Yandex Ad Network , a call is made by the exchange server supporting Yandex RTB to Yandex.Direct, Yandex Advertising Network and other Demand Side Platforms (DSP) connected to Yandex RTB.
For now, RTB on Yandex is available as an invite only.