655K accounts from Estonian Citizens (via Estonian Cybercrime Bureau) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In June 2018, the Cybercrime Bureau of the Estonian Central Criminal Police contacted HIBP and asked for assistance in making a data set of 655k email addresses searchable. The Estonian police suspected the email addresses and passwords they obtained were being used to access mailboxes, cryptocurrency exchanges, cloud service accounts and other similar online assets. They've requested that individuals who find themselves in the data set and also identify that cryptocurrency has been stolen contact them at cybercrime@politsei.ee.
Source: Have I Been Pwned (CC BY 4.0)