>The realistic estimate is that the US will face 300 to 500 warheads.

Does this include boomers?

I suspect that, given the a) greatly reduced number of Russian SSBNs at sea since the USSR's dissoluton,[1] and b) improvements in Western technology since that event, the US and allies a) have every Russian SSBN under 100% surveillance by a SSN, and b) can take every Russian SSBN out with a good approximation of success. Am I off base in my thinking?

[1] Yes, I know about the Russian ability to launch in port. Events of the past month have made me less confident about this ability's functionality.