Re: warning them not to target Blighty
The SS-N-19 is even due to be obsoleted: It will be replaced with the 3M22 Zircon within 5 years, and that will be capable of Mach 5. Good luck intercepting one of those. In the meantime, the 3M-43 Klub is a more modern alternative, and the Klub-K variant can even be launched from a cargo container.
Then there's the VA-111 Shkval, which exceeds 200 knots underwater (it's a supercavitating rocket-powered torpedo). These have been in the Russian navy for yonks (the Kursk was sunk in 2000 by a bunch of these torpedos leaking propellant chemicals, due to lack of maintenance.) Of course, the Russian navy was in dire straits back in 2000 - but things have changed considerably, since.
Iran also has its own variant of the VA-111 Shkval (named the Hoot), too.
Perhaps this is why the anti-Russian rhetoric is being stepped up to hysteric proportions: The US knows it cannot afford to wait until Russia has weapons in place that make its entire Navy obsolete overnight.
But a war with Russia will be unlike any war the West has ever fought.