Edward Snowden, the whistleblower whose unprecedented leak of top-secret documents led to a worldwide debate about the nature of surveillance, insisted on Monday that his actions had improved the national security of the United States rather than undermined it, and declared that he would do it all again despite the personal sacrifices it caused him.
In remarks to the SXSW culture and technology conference in Texas, delivered by video link from his exile in Russia, Mr. Snowden, a former National Security Agency (NSA) contractor, took issue with claims by senior officials that he had placed the U.S. in danger.
