The government of Theresa May has not provided any credible and verifiable proof on the Skripal Case, neither to Russia, nor the public; not even to the EU or Britain’s allies in NATO.
Recurrent pro-Kremlin narrative denying that Russia has anything to do with the poisoning and attempted murder of former Russian GRU officer Sergei Skripal and his daughter Yuliya in Salisbury. The pro-Kremlin disinformation campaign disseminated over 20 different and often mutually contradictory theories about the attack in Salisbury (more here).
UK police and intelligence investigations have produced hard evidence which is sufficient to charge two Russian nationals for the attack on the Skripals. These two individuals have been established as officers of the Russian Military Intelligence, GRU. More UK public documents/statements on the case here and here.
The EU Member States support the UK findings, and decided unanimously to introduce sanctions against the GRU officers responsible and their commanding officers.
Read more about the conflicting disinformation narratives around the Skripal poisoning here.