Washington is behind the recently released offshore revelations known as the Panama Papers, WikiLeaks has claimed, saying that the attack was "produced" to target Russia and President Putin.

On Wednesday, the international whistleblowing organization said on Twitter that the Panama Papers data leak was produced by the Organized Crime and Corruption Reporting Project (OCCRP), "which targets Russia and [the] former USSR." The "Putin attack" was funded by the US Agency for International Development (USAID) and American hedge fund billionaire George Soros, WikiLeaks added, saying that the US government's funding of such an attack is a serious blow to its integrity.

Organizations belonging to Soros have been proclaimed to be "undesirable" in Russia. Last year, the Russian Prosecutor General's Office recognized Soros's Open Society Foundations and the Open Society Institute Assistance Foundation as undesirable groups, banning Russian citizens and organizations from participation in any of their projects.

Prosecutors then said the activities of the institute and its assistance foundation were a threat to the basis of Russia's constitutional order and national security. Earlier this year, the billionaire US investor alleged that Putin is "no ally" to US and EU leaders, and that he aims "to gain considerable economic benefits from dividing Europe."