https://www.npr.org/2022/03/27/1088683957/what-is-nato-ukraine-russia-putin

"The past is never dead; it's not even past." -William Faulkner

The North Atlantic Treaty Organization was created in 1949 by the United States, Canada, and several Western European nations to provide collective security against the Soviet Union. Membership in NATO has expanded over the years, but Ukraine has not entered NATO essentially because of Russia's opposition to it and the conflict that its admission would cause.

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