Despite the Trump administration’s decision to treat it as an afterthought, arms control is not dead.
https://www.rbc.ru/newspaper/2018/01/16/5a5c91679a7947598db1212a
https://www.kommersant.ru/doc/3521159
The existence of the underwater nuclear carrier, codenamed Kanyon by the U.S., has been rumoured in the past, but the leaked draft of Pentagon's Nuclear Posture Review confirmed this.
http://www.dailymail.co.uk/news/article-5270337/Russia-underwater-drone-carry-nuclear-bombs.html
https://focus.ua/world/389121/
http://expert.ru/expert/2018/03/vse-idet-k-vojne/
http://expert.ru/expert/2018/03/tramp-otkladyivaet-yadernuyu-zhertvu/
https://www.kommersant.ru/doc/3520836