The cyber-crime network, known as the Infraud Organization, operated under the slogan "in fraud we trust", the DOJ told reporters on Wednesday.
"Today's indictment and arrests mark one of the largest cyberfraud enterprise prosecutions ever undertaken by the Department of Justice", Acting Assistant Attorney General John P. Cronan said in a statement.
Deputy Assistant Attorney General David Rybicki told a press briefing in Washington that Okeakpu had been arrested in the United Kingdom and faces racketeering conspiracy charges.
Along with Bondarenko, those arrested included a number of moderators for the forum, along with vendors and "VIP members", although the overall number arrested was only a small percentage of the forum's estimated 11,000-plus members.
USA investigators estimate the site's members meant to cause $2.2 billion worth of damage, but actual losses amounted to over $530 million.
Super moderators on the site "oversaw and administered specific subject matter areas within their expertise", according to USA authorities.
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In a later statement, it added a Turkish army tank had been hit in another attack, killing all five servicemen inside. The statement said that since the beginning of the operation 13 Turkish soldiers had been martyred and 57 wounded.
Prosecutors claim that the scammers aimed to inflict losses of $2.2 billion in stolen revenue.
The criminal group operated from an online forum, through which users could offer or buy illicit services, including malware capable of data breaches.
Thirteen members of the "Infraud Organisation" were arrested in the United States, Australia, Britain, France, Italy, Kosovo and Serbia, it said.
Infraud is said to have 10,901 registered members and was founded by Bondarenko, a 34-year-old Ukranian man. Members of the group were charged on nine criminal counts, including wire fraud, computer crimes, and conspiracy to racketeer.
"The Department of Justice refuses to allow cybercriminals to hide behind the anonymity of the web while stealing personally identifying information, emptying bank accounts, and wreaking havoc on our nation's digital infrastructure and financial system".
"This case reflects the alarming and increasing threat posed by cybercrime", Mr Rybicki said.
The City of London Police are credited alongside other global police forces for "siginificant efforts and timely cooperation".