No. I don't think they want to do that. That would be much bloodier. An enemy is always going to fight to the last to protect their capital. I think for now they are just pinning enemy troops up there. And they are digging in expecting a frontal attack, if the rooskies side slip them they won't be mobile enough in their burrows to catch them..
The way I was proposing was to achieve the strategic goal (effective control of Ukraine) with minimal deaths. A quick a fait accompli with minimal deaths will weaken US calls for sanctions compared to a bloodbath meat-grinder of grinding straight at the capital.
This would be more like Vlad to flip around and get them in a chock-hold like a judo maneuverer, rather than simply pummeling them to death with his fists.
But who knows.
I'm more interested first in your "if" estimate percentage wise?
I'm curious as to what is fielded by each army group in terms of equipment. I'm not inclined be believe that they are
all equipped with the "best of the best", but I'm certain they do have quite a bit of the "top tier" equipment at their disposal. I'd be willing to guess that almost all of the equipment will be "top tier", seeing as those troops are along the western boarder. Example: It is a reasonable guess that
at least 90% of their T-80's and T-90's will be the Western side of Russia as a whole.
If Russia is serious enough, they might pull stuff from other groups that are unlikely to be participating, like units from their Eastern District. I doubt this will be the case, as they have a huge number of equipment and men on reserve. They'll want to keep their Eastern units intact, as a "show of force" to the US, Japan and even China, though to the world as a whole. If anything they might bolster their Eastern units a little. Not so much as to be presumed a threatening gesture, but enough to say, "Nothing to see here, move along.". It's not like the lack the reserves to do it. Also, you may wonder why I included China; reason is simple, they wouldn't want to appear weak in any way to their neighbor. Pulling anything from their Eastern units will likely be presumed as "Russia is weak" in China's eyes.
I agree, Russia will use a blitzkrieg to avoid any prolong fighting. The question is, for example, will they lead with their T-90's or will they lead with their older tanks like the T-72? While you'd think the T-90 is an obvious choice, they are more expensive and they have far fewer of them as opposed to the T-72's. But leading with older, more "well known" tanks will have obvious drawbacks as well. Again, it'll depend on how serious Russia is if they go through with it. Dead serious, and it's a very good bet that
all of lead units will be equipped with the "best of the best".