- British counterterror agents take over probe of Russian ex-spy’s mysterious collapseLos Angeles Times
- Britain Threatens ‘Robust’ Response If Russia Behind Spy PoisoningVoice of America
- Factbox: From polonium to a poisoned umbrella – mysterious fates of Kremlin foesReuters
- Russian spy Sergei Skripal’s visit to Zizzi in Salisbury could be where Cold War-style poison trail beganThe Sun
- Russian assassins must not be tolerated on British soilTelegraph.co.uk