http://www.kasparov.ru/material.php?id=5ABE232E2A6DB
https://ru.krymr.com/a/29134813.html
https://www.kommersant.ru/doc/3586962
https://www.kommersant.ru/doc/3585502
http://www.ng.ru/economics/2018-03-28/1_7199_sila.html
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.rbc.ru/newspaper/2018/03/26/5ab3dcce9a794774c773dc8a
https://www.kommersant.ru/doc/3585474