- Russian spy: Retaliation could be painful for UK businessBBC News
- Russia calls poisoning accusations by Britain ‘nonsense’Los Angeles Times
- Novichok: What is Russia’s dangerous poison used in ex-spy Sergei Skripal’s case?USA TODAY
- Pick Your Poison: What the Nerve Gas Assassination Attempt Tells Us About RussiaPopular Mechanics
- Russia is a rogue state. Will Theresa May do what Trump hasn’t?CNN