you “know” that “Russia has a pattern of this sort of behaviours” because the BBC told you so
No. Other reliable sources have also mentioned the stories I raised. Here is the UK police talking about the Russia-backed arson of a warehouse in London. And here on the UK government's website you can find the report of the inquiry into the Salisbury poisonings (with a Russian chemical weapon) in 2018.
That inquiry which I mentioned was conducted by a senior judge, who concluded this:
Petrov, Boshirov and Fedotov were members of an operational team within the GRU – the Russian military intelligence agency responsible for foreign intelligence gathering. I am sure that, in conducting their attack on Sergei Skripal, they were acting on instructions. I have concluded that the operation to assassinate Sergei Skripal must have been authorised at the highest level, by President Putin.