If you want to learn more about Russia and China's militarization of space, The Shadow War by Jim Sciutto (Chief National Security Correspondent for CNN) is a good place to start. It could be a one-sided effort (I doubt he has access to RU and PLA national security insiders like he does in the US), but it definitely sounds like Russia and China have moved ahead of the US in this realm, in terms of actual satellite based shenanigans.

You'll also understand the at times seemingly random actions of those two countries a little more.

https://www.amazon.com/Shadow-War-Russias-Operations-America...