London refused the request of Russia in the case of Skripale

The UK has refused a request from the Investigative Committee of Russia for mutual assistance in the investigation of the Skripale case, said Russian Foreign Minister Sergey Lavrov.
“For several months, this request was kept unanswered. A few days ago, a response was received, which officially stated that for reasons of national security, the United Kingdom could not provide us with assistance in this particular criminal case related to the fate of citizens of the Russian Federation,” he said in an interview RT France, Paris Match and Figaro.
Sergei Skripal has dual citizenship - Russian and British, but Yulia Skripal - only Russian, and international conventions require London to provide access to it, the foreign minister recalled.

On March 4, the former GRU officer Sergey Skripal and his daughter Yulia were poisoned in Salisbury, which provoked a major international scandal: in London they immediately rushed to blame Russia for this.

Moscow has repeatedly offered to conduct a joint investigation, but Britain ignored this initiative. The Foreign Ministry also caught Prime Minister Teresa May in a lie: she claimed that the poison had been made in Russia, but in Porton-Down laboratory it was refuted.
Later, London presented photographs of the two “suspects,” claiming that these were GRU officers, Alexander Petrov and Ruslan Boshirov. The men themselves said in an interview with the editor-in-chief of Sputnik and RT Margarita Simonyan that they visited Britain as tourists and are not associated with the special services.