States are increasingly using assassination to guard against the twin threats of terrorism and weapons of mass destruction.
Why were the Russians behind the story not properly acknowledged?
'For Petrov and Boshirov the interview has very high stakes -- and throughout the interview they both appear very anxious and uncomfortable.'
The UK has become surprisingly willing to brief the press about possible use of cyber attacks, including against Russia in response to the Skripal attack.
The Skripal case shows how Russian intelligence services have the confidence to carry out shoddy operations, seemingly unconcerned about whether or not they will be discovered.
How Vladimir Putin is using hostility towards Russia to bolster his own position at home.
Tensions with Russia and the US have made both partners in the Brexit negotiations more aware of their shared interests than they seemed to be a year ago.
Australia has joined its allies in expelling Russian diplomats as retaliation for a nerve-agent attack on a former Russian agent and his daughter. But the action is unlikely to trouble Russia.
The Australian government is expelling two Russian spies as part of a broad international retaliatory action against Russia.
The row over suspected Russian involvement in the assassination attempt on Sergei Skripal has sparked some very confrontational social media activity.
The attempted murder of a former Russian spy gives Britain a chance to find its feet – with the EU, NATO and a clutch of important allies on side.
An audio version of an in depth article on the story of how the nerve agent used in an attack on former Russian spy Sergei Skripal was developed.
A long read on how nerve agents were developed – and used in an attack on a former Russian spy on the streets of Salisbury.
Re-elected for a fourth term, Putin is not on the best terms with the rest of the world. But does he actually care?
The British PM says Russia is probably responsible for the attack on Sergei Skripal. But getting definitive proof could mean compromising British intelligence work.
International law on chemical weapons fails without mutual trust and transparency.
Theresa May says Britain could unleash 'extensive measures' against Russia following the nerve agent poisoning of ex-spy Sergei Skripal.
Hundreds of people have been warned after former Russian spy Sergei Skripal was poisoned with Novichok nerve agent.
The UK is pointing the finger at Russia for the nerve agent attack on a former spy. How should the government react?
Even if they do eventually wake up, Sergei and Julia Skripal could suffer permanent damage as a result of their exposure to a Novichok nerve agent.