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.