Julian Assange was in classic didactic form, holding forth on the topic that consumes him — the perfidy of big government and especially of the United States.

Mr. Assange, the editor of WikiLeaks, rose to global fame in 2010 for releasing huge caches of highly classified American government communications that exposed the underbelly of its wars in Afghanistan and Iraq and its sometimes cynical diplomatic maneuvering around the world. But in a televised interview last September, it was clear that he still had plenty to say about “The World According to US Empire,” the subtitle of his latest book, “The WikiLeaks Files.”

From the cramped confines of the Ecuadorean Embassy in London, where he was granted asylum four years ago amid a legal imbroglio, Mr. Assange proffered a vision of America as superbully: a nation that has achieved imperial power by proclaiming allegiance to principles of human rights while deploying its military-intelligence apparatus in “pincer” formation to “push” countries into doing its bidding, and punishing people like him who dare to speak the truth.

Notably absent from Mr. Assange’s analysis, however, was criticism of another world power, Russia, or its president, Vladimir V. Putin, who has hardly lived up to WikiLeaks’ ideal of transparency. Mr. Putin’s government has cracked down hard on dissent — spying on, jailing, and, critics charge, sometimes assassinating opponents while consolidating control over the news media and internet. If Mr. Assange appreciated the irony of the moment — denouncing censorship in an interview on Russia Today, the Kremlin-controlled English-language propaganda channel — it was not readily apparent.