Dan Lomas, a UK academic, adds some context to the allegations and attempted murders. He makes two points near the end:
Like Mossad’s suspected attacks on nuclear scientists, Litvinenko’s murder and the horrific attacks on other Russian dissidents are designed with one purpose: to instil fear in dissidents, opposition leaders and (like Skripal) former spies – and indeed, anyone potentially inspired by their behaviour. The message is clear: “Desist, or else.”
Whether Russia is involved in this latest incident or not, it should surprise no one that countries regularly use killing as a way to intimidate and pursue foreign policy goals. What remains to be seen in this case is how the British government will respond.
Link:https://theconversation.com/sergei-skripal-and-the-long-history-of-assassination-attempts-abroad-93021?