They have done it with less or any preparation compared to the Kharkiv direction where they had plowed the field with artillery and FAB. Looking even more like a scouting/poking incursion.
Ukraine forces will still need to react and divert some troops over there...
Ukraine moved a lot of units over to the Kharkiv' direction which as made it somewhat easier to advance in the Eastern Front, but not enough yet.
So far there is nothing more about the Sumy direction. But if the Russians want to get real results they'd have to open Sumy and Chernigov fronts again with the same tactics. A big downgrade in troop presence in the East to plug up the north would have serious consequences for Ukraine.
![Sumy%20Battle%20Map%20Draft%20June%2010%2C%202024.png](https://www.understandingwar.org/sites/default/files/Sumy%20Battle%20Map%20Draft%20June%2010%2C%202024.png)