1.48M accounts from KM.RU (km.ru) were exposed in this breach. Besides email addresses, it included dates of birth, genders and geographic locations.
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Dates of birthEmail addressesGendersGeographic locationsRecovery email addressesSecurity questions and answersUsernames
In February 2016, the Russian portal and email service KM.RU was the target of an attack which was consequently detailed on Reddit. Allegedly protesting "the foreign policy of Russia in regards to Ukraine", KM.RU was one of several Russian sites in the breach and impacted almost 1.5M accounts including sensitive personal information.
Source: Have I Been Pwned (CC BY 4.0)