Britain is seeking help from other European countries to take action against Russian spy networks that could prepare for attacks similar to the nerve attack on a former Russian spy in England.
British Prime Minister Theresa May will urge joint action between 
the states of the European Union, at the next summit in Brussels on Thursday, where it will also try to convince the leaders of the member countries to condemn Russia directly for the attack on Salisbury.
"Russia has staged a shameless and reckless attack on the UK," May told reporters upon their arrival at the summit.
"It is clear that the Russian threat does not respect national borders and the Salisbury incident was a clear act of Russian aggression against Europe and its neighbors."
Russia is accused of the first known offensive use of a nervine toxin in Europe since World War II after Sergei Skripal, a former Russian double agent, and his daughter were found unconscious on a public bench in the English city on 4 last March.
In the worst crisis between the two powers since the Cold War, May expelled 23 Russian diplomats who, according to British intelligence, were spies working undercover in the UK. Moscow, which denied involvement in the attack, took identical retaliatory measures, condemning the British hostile attitude and the fact that it did not allow her to participate in the investigation, as required by international law, since she had died a Russian citizen, the daughter of Skripal.