Kyivstar telecom outage (Solntsepyok / Sandworm front) (KYIVSTAR-2023)
OT disruption · disclosed 2023-12-12 · region: EU · primary attribution: Sandworm Team
Sectors touched: Telecommunications
Largest Ukrainian mobile operator (~24M subscribers) knocked offline for days. Sandworm front "Solntsepyok" claimed the attack. Disrupted air-raid alerts in some regions during active Russian missile strikes — first public cyber operation against civilian wartime communications at this scale.