Guards () or Guards units () were and still are elite military units of Imperial Russia, the Soviet Union and the Russian Federation. The tradition goes back to the a chieftain's druzhina of medieval Kievan Rus' and the Marksman Troops (Стрелецкое Войско), the Muscovite harquebusiers formed by Ivan the Terrible by 1550. The exact meaning of the term "Guards" varied over time.