On Thursday, I questioned Russia's involvement in mass surveillance on live television. I asked Russia's president, Vladimir Putin, a question that cannot credibly be answered in the negative by any leader who runs a modern, intrusive surveillance program: "Does [your country] intercept, analyze or store millions of individuals' communications?"

I went on to challenge whether, even if such a mass surveillance program were effective and technically legal, it could ever be morally justified.

The question was intended to mirror the now infamous exchange in US Senate intelligence committee hearings between senator Ron Wyden and the director of national intelligence, James Clapper, about whether the NSA collected records on millions of Americans, and to invite either an important concession or a clear evasion. (See a side-by-side comparison of Wyden's question and mine here.)

Clapper's lie – to the Senate and to the public – was a major motivating force behind my decision to go public, and a historic example of the importance of official accountability.

Read the rest of this article at The Guardian...

• Edward Snowden wrote for the Guardian through the Freedom of the Press Foundation