Monthly report from UCDP event data for Sumy oblast, Ukraine. Country-wide report: Ukraine, December 2025.
45events37 the month before
81est. deaths
8civilian deaths
In December 2025, UCDP recorded 45 organized-violence events in Sumy oblast, Ukraine, with 81 estimated deaths. That is +22% compared with 37 events the month before.
100% of the month's events were state-based armed conflict. Civilian deaths: 8.
The most active pairing was Government of Russia (Soviet Union) - Government of Ukraine with 45 events.
Where events happened
Recorded organized-violence events in Sumy oblast, December 2025. Circle size scales with estimated deaths.State-based Non-state One-sidedOutlines: Natural Earth.
Deadliest events, December 2025
Date
Where
Parties
Est. deaths
31 Dec 2025
Sumy raion Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
31 Dec 2025
Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
30 Dec 2025
Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
29 Dec 2025
Sumy raion Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
29 Dec 2025
Sumy raion Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
28 Dec 2025
Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
27 Dec 2025
Sumy raion Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
26 Dec 2025
Sumy raion Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
25 Dec 2025
Sumy raion Sumy oblast
Government of Russia vs Government of Ukraine State-based
2
24 Dec 2025
Sumy raion Sumy oblast
Government of Russia vs Government of Ukraine State-based