Ask AI: what russian czar expanded russian rule east to the pacific

The Russian czar who expanded Russian rule eastward to the Pacific was Peter the Great (reigned 1682–1725). Under his rule, Russia undertook significant expansion and exploration to the east. However, it's worth noting that the territorial expansion to Siberia and eventually to the Pacific Ocean began earlier under the rule of other Russian leaders, particularly during the reigns of Ivan the Terrible (1533–1584) and subsequent czars in the late 16th and early 17th centuries. Yet, it was under Peter the Great that Russia solidified its presence and established stronger control over these vast territories, positioning Russia as a major European power with access to the Pacific Ocean.