The hackers targeted "accounts of Russian and USA government officials, including cybersecurity, diplomatic and military personnel", according to the indictment. Or officials, as it were.
The Russian actors will be charged with hacking, wire fraud, trade secret theft and economic espionage, according to officials who spoke to theWashington Post.
The hacks allegedly targeted the email accounts of Russian and U.S. officials, Russian journalists, and employees of financial services and other businesses, according to the officials.
The FBI and the Central Intelligence Agency have both corroborated reports that Russian hacking - in that instance, of Democrats' email accounts - was also involved in an attempt to help Donald Trump win the 2016 presidential election.
In September, Yahoo said hackers had managed to steal personal data on more than 500 million users during an attack in late 2014.
Two other hackers who were also indicted acted with the backing of Moscow, said Justice Dept. and Federal Bureau of Investigation officials in Washington DC.
22-year-old Karim Baratov, a Canadian-Kazakh national, is one of four people including two Russian security officers who have been charged. He obtained "at least a portion" of Yahoo's User Database that included users' names, recovery email accounts, phone numbers and other information needed to create account authentication web browser "cookies".More news: Economic realities scupper Commonwealth Games in SA
The massive 1bn-account data breach was one of the biggest in history and nearly derailed the $3.8bn takeover of Yahoo by Verizon, shaving $350m off the price tag.
It is still unclear if a 2013 hack that resulted in the theft of more than one billion Yahoo accounts was related to the 2014 hack or carried out by the same or related individuals.
The United States does not have an extradition treaty with Russian Federation.
One of the hackers, Alexsey Alexseyevich Belan, has been on the FBI's Cyber Most Wanted criminals since November 2013.
The United States has indicted two Russian intelligence officers over a cyberattack, the first such move against Russian officials by Washington.
Neither of the Russian intelligence officers are in USA custody.
"The indictment unequivocally shows the attacks on Yahoo were state-sponsored", Yahoo Assistant General Counsel Chris Madsen said in a statement. The company informed the representative plaintiff, Natalia Karasik, of Barrie, late previous year that her information was part of a hack of its servers in 2013.