https://www.radiosvoboda.org/a/donbass-realii-radioaktyvna-katastrofa/29138530.html
https://www.gazeta.ru/politics/2018/03/26_a_11695807.shtml
https://ru.krymr.com/a/29139531.html
http://www.kasparov.ru/material.php?id=5ABE232E2A6DB
https://www.kommersant.ru/doc/3585502
Why would Russia, which has over 1,500 deployed strategic nuclear warheads that can be delivered from existing ballistic and cruise missiles, invest in new, exotic systems? The answer is deeply rooted in modern Russian and Soviet history.
https://www.rand.org/blog/2018/03/red-glare-the-origin-and-implications-of-russias-new.html
https://www.kommersant.ru/doc/3585474
https://ru.krymr.com/a/29114846.html
https://www.iiss.org/en/regions/russia/60-2-03-tertrais-cm-3377
The quotation in the title comes from the Russian Foreign Ministry, brushing off UK demands for an explanation of why Russia poisoned Sergei Skripal. That the Russians said this is a good sign that they have not entirely forgotten the risks of attacking the United States.