Two years after he leaked secret NSA documents, former NSA contractor Edward Snowden says he does not regret his decision.

In an op-ed for the New York Times on Thursday, Snowden wrote that one of his biggest worries prior to releasing the documents to journalists was that public would simply be indifferent.

That hasn't happened.

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"Two years on, the difference is profound. In a single month, the NSA’s invasive call-tracking program was declared unlawful by the courts and disowned by Congress. [...] This is the power of an informed public," he wrote.

Among other victories for his cause, Snowden listed ending the mass surveillance of private phone calls under the Patriot Act as well as the U.N. declaring mass surveillance a violation of human rights. Just this week, Congress approved sweeping changes to surveillance laws enacted after the Sept. 11 attacks, eliminating the NSA's disputed bulk phone-records collection program and replacing it with a more restrictive measure to keep the records in phone companies' hands.

But Snowden also noted there the struggle is far from over. Threats to our privacy, he argued, include popular online services taking part in the NSA's mass surveillance programs, cellphone location records of citizens being intercepted and metadata of ordinary Internet users being monitored.

"As you read this online, the United States government makes a note," he wrote.

And despite the threats and hurdles — he currently resides in Russia, where he was granted asylum after fleeing from Hong Kong in June 2013 — Snowden is hopeful that the U.S. is treading in the right direction.

"With each court victory, with every change in the law, we demonstrate facts are more convincing than fear. As a society, we rediscover that the value of a right is not in what it hides, but in what it protects," he continued in the Times.

Snowden initially kept a low profile following his disclosures, but has grown increasingly active in the media. In the past year alone, he spoke at numerous conferences via teleconferencing, including the Nordic Media Festival in Bergen, Norway; the International Students for Liberty in Washington, D.C.; and FutureFest in London. In an interview with Last Week Tonight host John Oliver in April, he described the U.S. government's capabilities and efforts to intercept people's personal data using "dick pics," and in February, he answered questions on Reddit.