1.19M accounts from Yandex Dump (forum.btcsec.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In September 2014, news broke of a massive leak of accounts from Yandex, the Russian search engine giants who also provides email services. The purported million "breached" accounts were disclosed at the same time as nearly 5M mail.ru accounts with both companies claiming the credentials were acquired via phishing scams rather than being obtained as a result of direct attacks against their services.
Source: Have I Been Pwned (CC BY 4.0)