In general, scholarships connected to RUB (e.g., Deutschlandstipendium) can apply across many subjects because they are aimed at (prospective) RUB students with excellent performance and engagement, not only one department.
Medicine: RUB offers Medicine (State Examination) and it is primarily German-taught, with highly competitive admission; international students can apply but should expect strict language and admission requirements. Scholarships for Medicine are possible but usually not “Medicine-only” at RUB—more often they come via larger programs (e.g., DAAD) or external sponsors.
Engineering & STEM: RUB is strong in engineering/computer science/natural sciences, and scholarships may be used in these fields as long as you meet criteria (grades, motivation, engagement). Nisa Narimanova also highlighted the importance of fit: she researched “program structure” and “course offerings” to match her sustainable development interests.
Business & Humanities: RUB offers business/economics and a wide range of humanities/social sciences; scholarships are typically open to eligible students in these areas too.