I agree with @Thorkill65's assessment that there are likely around 50 Russian soldiers in Dobropillya right now. At least a couple hundred Ukrainian soldiers are probably also present.

The bulk of them are concentrated in the southwestern and southeastern parts of the city, while a few other small groups are in the northeastern streets closer to Hannivka.

These large-scale infiltrations into Dobropillya means the Ukrainian strongpoints south of the city are at risk of being cut off, with supply into these areas already very difficult. There have also been a larger number of infiltrations into the fields southwest of Dobropillya, reaching the main highway resupplying Ukraine's garrison there. A large grey-zone has formed there, where Russian soldiers are attempting to accumulate to begin an encircling and absorbing maneuver on the city.

Furthermore, these infiltrations force Ukrainian drone operators out of their positions in Dobropillya, disrupting Ukraine's FPV drone strikes on Russian logistics and assault operations, allowing further Russian advances and deep infiltrations to be made.