by 900 ce, kiev controlled the large area between the baltic sea and the black sea, which made…

by 900 ce, kiev controlled the large area between the baltic sea and the black sea, which made kiev\ndifficult to rule.\ndifficult to defend.\na very powerful state.\nwant to expand even further.
Answer
Brief Explanations:
Controlling a large - scale territory between two major seas was a sign of significant power in the medieval period. A large area under control indicated economic, military, and political strength.
Answer:
a very powerful state.