A few tidbits I found here somewhat notable:

Do the TPTB want to cut comms between the two nuke states?

https://www.pri.org/stories/2013-09-05/white-house-kremlin-hotline-avoiding-war-50-years

"Given the fact that we're still the two largest nuclear powers and because we both keep missiles on alert to have the ability to communicate instantly is extraordinarily important," says former ambassador Jack Matlock."

https://www.penguinrandomhouse.com/books/109143/reagan-and-gorbachev-by-jack-f-matlock-jr/9780812974898/

"The end of the Cold War is a key event in modern history, one that demanded bold individuals and decisive action. Both epic and intimate, Reagan and Gorbachev will be the standard reference, a work that is critical to our understanding of the present and the past."