Atsar was a russian leader in early 1900 who was similar to a?

A tsar was a Russian leader in early 1900 who was similar to a king.

Explanation:

Tsar is a royal title for the historic rulers of Bulgaria, Serbia and Russia. Depending on the country and time, Tsar can be equated with emperor or king.

The term Tsar is commonly associated with the Moscow Empire, although the Bulgarian ruler Simeon I (893-927) was the first to receive this title in recognition of his services to the First Bulgarian Empire. In connection with the idea of the Third Rome, the Tsar's title is a symbol of the successors of Rome and of the imperial claims of a monarch.

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.