Morbidly enough this incident appeared on the UK A-level physics paper one year as part of the module on nuclear physics. I think the task was to explain why alpha radiation is so dangerous if ingested.
I'm not sure I would the poisonings "reckless", they are deliberate, calculated and successful. Of course they could instead make it look like an accident or a drug overdose; or just take the target out by sniper. Instead the Russian government orchestrates obscure methods that make it much more interesting for the international press, as well as making it obvious for everyone that it was the FSB without completely destroying plausible deniability.
That's completely different from "people staffing an air defense system were reckless/undertrained/misinformed and accidentally shot down an airliner".
I’m not sure you know the full story regarding the Skripal poisoning. The target and his daughter actually survived. Two “civilians” were later poisoned after discovering a discarded purfume bottle which contained the novichok. One of those people died. So the targets survived, a British citizen was murdered, and the Russian’s faced little consequences.
Using your own secret service to kill your own population for political gain:
"Russian apartment bombings" https://en.wikipedia.org/wiki/Russian_apartment_bombings
Radioactive attacks in another country:
"Poisoning of Alexander Litvinenko" https://en.wikipedia.org/wiki/Poisoning_of_Alexander_Litvine...
Chemical attacks in a NATO country:
"Poisoning of Sergei and Yulia Skripal" https://en.wikipedia.org/wiki/Poisoning_of_Sergei_and_Yulia_...
Poisoning political enemies in another country:
"Navalny says he tricked FSB agent into admitting poisoning" https://www.france24.com/en/live-news/20201221-navalny-says-...