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.
Police are believed to have identified the suspected perpetrators of the Novichok attack on Sergei and Yulia Skripal in Salisbury, the Press Association says.
The foreign secretary faces new questions over his involvement in a £161,000 donation by the wife of Vladimir Putin’s former finance minister to the Conservative party in the wake of the poisoning of former Russian spy Sergei Skripal.
Nerve agents were discovered by accident in the 1930s.
Theresa May faces increasing pressure to take action against those responsible for the nerve agent attack on a former Russian spy and his daughter.