All of the indicted individuals worked for the Russian military intelligence agency, GRU. They were accused of interfering in the 2016 presidential election by stealing and releasing documents from the DNC and DCCC through Guccifer 2.0 and DNCLeaks.Lukashev was a Senior Lieutenant in the Russian military assigned to Unit 26165. In 2016, he sent spearphishing emails to members of the Clinton Campaign and affiliated individuals, including the chairman of the Clinton Campaign. 

Spearphishing is an upgraded form of Phishing, it involves sending a spoof email but the email is geared toward a specific individual and appears to be from someone they know, often a superior, so the target will open the email. The message will seem important, if not vital, and ask the target to click something that secretly installs malware, or tells them to go to a specific url where they’ll be tricked into exposing their password.

Once the documents were obtained by Unit 26165, they were posted online and given to WikiLeaks using the personas Guccifer 2.0 and DNCLeaks.

The constitution of Russia doesn’t allow extradition, so it’s unlikely any of the officers will be brought to justice.