Direct proof of use
The United Kingdom publicly confirmed on May 11, 2023 that it had donated Storm Shadow missiles to Ukraine, describing them as a long-range conventional precision-strike capability intended to help Ukraine push back Russian forces based within Ukrainian sovereign territory.
On May 18, 2023, Defence Secretary Ben Wallace confirmed that Ukrainian forces had already used the UK-supplied missiles against Russian targets. The War Zone later identified an official Ukrainian photo showing a Storm Shadow carried by a Ukrainian Su-24, supporting the Su-24 as the public launch-aircraft integration.
Sources: Defence Secretary Oral Statement on War in Ukraine, Storm Shadow Used by Ukraine, Wallace Confirms, Su-24 Fencer Is Ukraine's Storm Shadow Missile Carrier
Narrative
Storm Shadow entered Ukrainian service as a Western-supplied long-range strike weapon after months of Ukrainian requests for capabilities beyond the range of earlier donated systems. The UK statement framed the transfer as a response to Russian long-range strikes and said the missiles would allow Ukraine to attack Russian forces inside Ukrainian sovereign territory.
In Ukrainian service, the missile's documented role was long-range precision strike and interdiction. Sources support Ukraine as the operator, the United Kingdom as the donor for the Storm Shadow missiles, Su-24 aircraft as the publicly documented launch platform, and Russian military targets in occupied or contested Ukrainian territory as the initial stated target set.
Specific strike attribution requires care. UK confirmation establishes that Ukraine used Storm Shadow by mid-May 2023, while later Crimea reporting documents cruise-missile attacks on Russian naval infrastructure but often does not distinguish Storm Shadow from SCALP-EG in every individual strike.
Sources: Defence Secretary Oral Statement on War in Ukraine, Storm Shadow Used by Ukraine, Wallace Confirms, Su-24 Fencer Is Ukraine's Storm Shadow Missile Carrier, AP Sevastopol Shipyard Attack