Alexander Litvinenko, an intelligence agent turned Kremlin critic, died in London in 2006 after drinking tea laced with the radioactive isotope polonium-210.
Britain has accused two Russians of the killing, but Moscow has refused to extradite them.
Coroner Robert Owen had decided to reveal some material, arguing that the disclosure was necessary for a "fair and meaningful" inquest into Litvinenko's death.
Today, Foreign Secretary William Hague succeeded in overturning Owen's decision to disclose some documents.
Goldring noted in his decision that the case concerned the risk of "significant damage" to national security.
"Nothing we have decided reduces the importance of open justice," he added.
Litvinenko's widow, Marina, said through her lawyer that she was "disappointed but not surprised" by today's ruling.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
