It’s something we have seen continuously, if anything, the fact that they have made massive progress in the south highlights some of their weaknesses, especially in the urban environment.
They’ve moved much slower in the last few days, primarily expanding on gains made in the first few days of the offensive.
Per the @TheStudyofWar map, the Russian advance continues to be slow. They have solidified their position outside of Kyiv, and fighting in the western suburbs is ongoing.
I will say, this map somewhat over represents the Russian control over areas in Ukraine. As we have seen, Ukrainian forces have been able to conduct a number of attacks behind Russian lines.
You can start to see it, the visible rear area Russian formations look more alert. They may not have air superiority, and AD units are becoming keenly aware that there may be enemy aircraft overhead.
The offensive to the east of Kyiv has made some significant progress, bypassing Sumy to move heavier units towards Kyiv. Granted they’re working with a long supply line but they seem to be rolling over a lot of stuff in their way.