Is it simply a case of karma? Or is this a deliberate cyber payback from the US?

After a series of leaks of hacked emails belonging to senior member of the Democratic Party and Hillary Clinton’s campaign, this week it was the turn for the disclosure of correspondence belonging to a top aide to Russian President Vladimir Putin. The emails suggest direct political and financial ties with pro-Russian separatists in eastern Ukraine.

Mr Putin has denied any connection to the separatists, whether with military or financial support, despite widespread evidence to the contrary. Fighting has raged in eastern Ukraine for two years, since rebels in the Donetsk region proclaimed their independence from Ukraine and sought to join Russia. Anywhere up to 10,000 people have been killed.

A group called Cyber Hunta hacked into the account of an assistant to presidential aide Vladislav Surkov (YouTube)

USA Today said a Ukrainian group called Cyber Hunta hacked into the account of an assistant to presidential aide Vladislav Surkov and uploaded more than 2,000 emails this week. Mr Surkov, although under sanctions for his role in the separatist conflict, travelled to Berlin this month with Mr Putin for a summit on Ukraine.

The hacked emails include a June 2014 list of casualties from the separatist Donetsk People’s Republic (DNR) in eastern Ukraine, sent by then-chairman, Denis Pushilin. Another email listed expenses to set up the DNR’s Ministry of Information.

The leaks followed claims from US intelligence agencies that Russia was responsible for a series of hacks on American officials. Some analysts suggested these new leaks could be a retaliation.

Earlier this month, Vice President Biden told NBC that the US would be “sending a message” over the hacking that Mr Putin would recognise.

“He’ll know it,” Mr Biden said. “And it will be at the time of our choosing. And under the circumstances that have the greatest impact.”

Mark Galeotti, senior researcher at the Institute of International Relations in Prague told USA Today that while there was no evidence that the leak was the direct retaliation that Mr Biden had threatened, there was plenty to suggest it was.

“I cannot help but wonder if this is the kind of response that US policymakers have been hinting at, following the various hacks blamed on Russia, either working through Ukrainians or simply handed to them,” he said.

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“This kind of a leak is enough to warn the Russians that the USA has certain capabilities and is willing to use them. Welcome to the world of proxy cyberwars.”

Kremlin spokesman Dmitry Peskov dismissed the emails as fake in comments to Russian news agencies, saying that Mr Surkov did not use an email. But Ukraine’s National Security Service said Wednesday that the emails were real.

The leak of the emails came as a new poll suggested that most Republicans believe Russia is attempting to influence the US presidential election.