It appears what was hit in Sumy was indeed a military target.

The Rapid Support Forces (RSF) recently launched a large-scale ground offensive against the Zamzam Refugee Camp in the besieged city of Al-Fashir, western Sudan, where the Sudanese Armed Forces (SAF) are currently holding out.

Reports suggest that more than 100 civilians, including 9 staff members of an international relief organisation, were killed in ground assaults and artillery and rocket shelling.

Videos have also surfaced showing field executions of civilians, including children and the elderly, while the homes of the displaced were set on fire.

From Ukrainian MP Maryana Bezugla:

2 missiles over Sumy Oblast, likely Kh-31Ps

Flying to Myropillya, Sumy Oblast

Impacted the vicinity of Myropillya.

Another missile is flying towards Bezdryk, near Sumy City.

Explosions in Sumy Oblast. Impacted somewhere near Mezhyrich.

Iskander threat from Kursk Oblast again

Iskander on Sumy Oblast

Additional missile (Kh-31P) towards Ugroidy, Sumy Oblast

Impacted the vicinity of Krasnopillya, Sumy Oblast

The Iskander disappeared. It may have hit an open area.

Another Iskander on Sumy

Also disappeared. It either hit an open area or was confused with MLRS.

Another missile in the direction of Sumy

Disappeared too.

These were probably just MLRS