Obviously Stalin committed crimes against his own people. But did he not, at least in part, atone for these crimes by defeating Nazism? It is clear that had Stalin not achieved this result, the Czech nation (and other nations) would not even exist. It would have been partially enslaved, destroyed and Germanised. Therefore the issue of Stalin’s crimes and merits is complex, as are issues related to World War II. As Schiller wrote in his Ode to Joy: supreme justice will judge our judges.
Summary
London accused the Kremlin of being behind the poisoning of ex-spy Sergei Skripal and his daughter in Salisbury, England, in March 2018. There was no solid evidence pointing to Moscow.
Disproof
The story advances a recurring pro-Kremlin disinformation narrative casting the Skripal poisoning as wholly unconnected to Russia.
Moscow's involvement in the poisoning has been proven via a throrough investigation. The British Police have presented a solid chain of evidence on the Skripal case, with pictures, connecting the suspects to the locations in the case. Parts of the material have been released to the public. The evidence was sufficient to charge two Russian nationals, Anatoliy Chepiga and Aleksandr Mishkin with the attack on the Skripals, both Russian military intelligence operatives from the GRU, who travelled to the UK using fake names and documents.
Following this attack, the United Kingdom notified the OPCW, invited them to confirm the identity of the substance involved, and briefed members of the Security Council. The OPCW’s independent expert laboratories confirmed the UK’s identification of the Russian produced Novichok nerve agent, specifically the purity of the toxin while emphasising that the OPCW team “worked independently and was not involved in the national investigation by the UK authorities. No State Party was involved in the technical work carried out by the Technical Secretariat, to ensure the integrity of the examinations and investigations.
According to the UK intelligence assessment, based on open-source analysis and intelligence information, in the past decade, Russia has produced and stockpiled small quantities of Novichok agents, long after it signed the Chemical Weapons Convention.
Novichok was developed in Russia in the 1970s and 1980s. It is so unusual, that very few scientists outside of Russia have any real experience in dealing with it and no country outside of Russia is known to have developed the substance. See reports here and here.