Was the Panama Papers "Leak" a Russian Intelligence Operation?

``I suggest that the purpose of the Panama Papers operation may be this: It is a message directed at the Americans and other Western political leaders who could be mentioned but are not. The message is: "We have information on your financial misdeeds, too. You know we do. We can keep them secret if you work with us." In other words, the individuals mentioned in the documents are not the targets. The ones who are not mentioned are the targets.''