http://nvo.ng.ru/armament/2018-03-30/5_990_sistem.html
https://www.finanz.ru/novosti/aktsii/rossiya-gotovit-rakety-v-otvet-na-vysylku-diplomatov-1019956143
http://www.kasparov.ru/material.php?id=5ABE232E2A6DB
http://www.rosbalt.ru/russia/2018/03/30/1692543.html
https://www.kommersant.ru/doc/3585502
https://lb.ua/world/2018/03/28/393191_kinzhal_sarmat_boevie_lazeri.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.kommersant.ru/doc/3585474
http://intersectionproject.eu/ru/article/security/gosudarstvennaya-programma-vooruzheniy-2027
https://ru.krymr.com/a/29120908.html