S225XR was a wingless, integrated rocket/ramjet powered, active radar-guided medium-range air-to-air missile concept initially proposed by a BAe Dynamics led team to meet the United Kingdom Ministry of Defence's, requirement for a missile to arm Eurofighter. S225XR was the ultimate in a series of proposed developments of the BAe Dynamics Skyflash pursued jointly by the UK and Sweden since the late 1970s.