My biorhythm is disturbed, and I've been tired lately.

The Russian Federation has a vast territory.

He has many Russian friends.

He can speak Russian fluently.

He is a famous historian and has written many history books.

He played Russian roulette, risking his life.

He is majoring in history at university.

He is trying to hide his embarrassing past.

He recognizes the importance of oral history.

He interprets world events from a historicism perspective.