The AFU is very selective in what it is targeting and the initial attack was to limit Russian gas exports and starve them of money. Sudzha is exactly the point that they needed to hold to do that and they did it with surprisingly low number of troops. Russia still has to move troops into the area and the quality that they are sending means there is little expected chance of escalation for now. There is minimal air and ground assets being assigned to that front, as they are scattered across multiple other fronts in Ukraine.