I’ll amend my statement. They've reduced their capabilities to near zero.

Is that better? Which one of their 1 deployable destroyers goes out with it?

Still wrong. The UK's military isn't "near zero." They have a fairly sizable military capacity, even apart from holes in their naval capabilities. Just like with the US, the fact that their Navy isn't up to snuff doesn't make their defensive capabilities near zero.

Had that happened near the US just OFF Chesapeake Bay the Coast Guard cutter assigned to trail the Russkie would’ve been on the radio to the Russian captain telling him in no uncertain terms to stand down. And then 5 minutes after that the Russian embassy would be getting phone calls.

And how do you know the British government didn't reach out to the Russian embassy? Or more importantly, whether you're correct about whether the Russian craft did anything wrong? The British MoD was quoted in the article, and it certainly seems like they reached the conclusion that these shots weren't fired anywhere in the direction of the craft and were intended solely to get the vessel to change course after earlier efforts failed:

An MoD spokesperson said: "Following attempts to contact a British vessel in the channel, the Grigorovich fired warning shots.

"These were not aimed at the vessel and were an attempt to prevent a possible collision."

More importantly, this doesn't say anything about the strength or weakness of the UK navy. Had they a much larger global naval force (with dozens of destroyers and aircraft carriers around the world), or had this incident taken place off the coast of another country with a bigger navy, this very likely would have played out exactly the same way. Russian warship legally going through international waters but within a few dozen miles of the coast gets shadowed by the local Navy, which doesn't do anything but monitor because the vessel is permitted to traverse the international waters. If Russian vessel doesn't break any maritime laws, the local Navy isn't going to do anything - and the British government probably won't have much occasion to even call the embassy if the facts are as the MoD appears to have determined. Sure, they might reach out to find out what happened - it's not great to have shots fired - but if the MoD is correct that the British vessel did not respond to prior efforts to get them to change course, all sides might just agree that what happened was proper and move on.