The Department of Justice on Wednesday said that it has indicted two Russian intelligence agency officers (as well as two others) in connection with the 2014 cyber-attack against Yahoo that compromised at least 500 million user accounts.

The two Russian Federal Security Service (FSB) officers allegedly involved in the hack are named as Dmitry Aleksandrovich Dokuchaev and Igor Anatolyevich Sushchin, both Russian nationals and residents. The DOJ also indicted Russian national and resident Alexsey Alexseyevich Belan as well as Canadian Karim Baratov, both of which were reportedly hired guns.

Charges levied by the DOJ are extensive and include conspiracy to commit wire fraud, theft of trade secrets, economic espionage, aggravated identity theft and conspiracy to commit computer fraud and abuse, just to name a few.

According to The Washington Post, this marks the first time that the US has brought criminal cyber charges against Russian government officials. The indictments are also part of the largest hacking case ever brought by the US.

The Post notes that the case is unrelated to the hacking of the Democratic National Committee and the investigation into the 2016 presidential campaign.

Yahoo last September said it believed the 2014 attack was carried out by state-sponsored actors. At the time it was disclosed, the hack was deemed to be the largest data breach. That designation was short-lived, however, as a billion user accounts were reportedly compromised in an attack that took place in August 2013 (but wasn’t disclosed until last December).