Russia's lower house of parliament, the State Duma, approved revoking the ratification of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) in the first of three readings on Tuesday.

The vote was passed by 412 votes to zero, with no abstentions.

Russian President Vladimir Putin said at the 20th Annual Meeting of the Valdai Discussion Club on October 5 that Moscow could potentially revoke its ratification of the CTBT, as a mirror response to the United States, which hasn't signed or ratified the treaty.

(With input from agencies)