Why would the Kremlin tell the world what they’re going to do?
Ukraine's behind the front lines support is distributed so Russian satellite and other intelligence can't easily find them. Russian targeting beyond the front is using google maps, that is why they launch Shahed-136s at apartments and civilian infrastructure. An example of how poor Russian intelligence is that it took Russia eighteen months to destroy one HIMARS. The US taxpayer got their money's worth out of that launcher.
His threat is what the Russian leadership wants to happen in their made up reality, when they know can't make it happen so easily. This is where Russian propaganda and flooding social media comes into play. The time a western tank explodes, Russia will claim they took out an entire storage base.
They don’t want the US or NATO to maintain a presence around the military facilities.
It’s so obvious it doesn’t matter. Just like it’s obvious Ukraine will disperse its weapons as much as possible, and will keep hitting Russian refined oil products capacity and storage. And so on, for both sides.