Part of why it is mysterious is that there has been a news blackout. It's not in the interest of Ukraine for the outside world to be getting unfiltered news about conditions on the ground. Consider this problem https://en.wikipedia.org/wiki/Bomb_damage_assessment If somebody gets bombed out of their house and shoots some footage of the neighborhood and uploads it to YouTube or TikTok the Russians can view that and kn…
There has been lots of clouds, so not satellite imagery for a while. Supposed to clear up later this week iirc. They are likely setting up forward operating bases and a large scale attack will happen eventually.
https://en.wikipedia.org/wiki/Multiple_rocket_launcher
to bombard Kyiv. Doing so is a challenge because the only thing equal to the rate that kind of weapon can launch damaging rockets is the rate at which it has to be resupplied. Thus to make that large scale attack they have to be in control of logistics.
There are now constellations of SAR satellites that should give a pretty good picture of that convoy
https://en.wikipedia.org/wiki/Synthetic-aperture_radar
Ukraine has asked for access to this data, I sure hope they are getting it. If they are it doesn't matter if there are clouds or not.