15 September 2015.
In other Yandex-related news, the search engine has updated its algorithm to penalise websites that sell links.
Websites that sell links will now have their Yandex Quotation Index, similar to Google Page Rank, reduced to zero, thereby reducing their SEO ranking and making them unappealing to potential link buyers.
Several hundred websites are thought to have been affected by the algorithm change.
Yandex has said that once websites remove the offending links and get re-crawled, the penalty will be removed and their previous rankings will be restored.
This is not the first time that Yandex has altered its algorithm to dissuade people from using paid links to artificially boost their rankings. In May of this year, Yandex started penalising sites which bought links, making it a negative ranking factor.