Direct proof of use
Sudan's Su-24 Fencer aircraft entered the Yemen war through the Saudi-led coalition campaign that began in March 2015. Defense News reported on April 1, 2015 that Sudanese Air Force bombers had participated in coalition operations in Yemen, citing Sudanese President Omar al-Bashir and a Sudanese Armed Forces statement that described Sudanese air crews bombing Houthi targets and patrolling Yemeni skies.
The same Defense News report identified four Sudanese Su-24 Fencers at King Khalid Air Base in coalition-command video. Sudan Tribune separately reported Bashir's statement, described Sudan's contribution as three Russian Sukhoi-24 fighters and transport aircraft, and noted Al Arabiya footage of Sudanese Su-24s at King Khalid Air Force Base.
Sources: President: Sudan Launches Strikes in Yemen, Sudanese Planes Pound Houthi Targets in Yemen
Narrative
The Su-24's documented Yemen role was as a Sudanese strike aircraft attached to the Saudi-led coalition rather than as a Yemeni government aircraft. The coalition intervened to restore President Abd-Rabbu Mansour Hadi's government after Houthi-aligned forces expanded from Sanaa toward Aden, and the Yemen Data Project records the 2015-2022 coalition air war as a Saudi- and UAE-led bombardment campaign that included Sudan among participating coalition states.
Open reporting supports deployment, basing, and air-operation claims more clearly than it supports attribution of individual strike sites to specific Su-24 airframes. Defense News says the Sudanese Armed Forces statement did not specify the exact mission type conducted by the Fencers, while still reporting Sudanese air operations and confirming Su-24 aircraft at the Saudi base used for the campaign.
Sources: Yemen Data Project Saudi Air War, President: Sudan Launches Strikes in Yemen