As Germany gained power in the run-up to World War II, the United States and the United Kingdom formed an alliance to Russia as an example of their appeasement policy.
What is alliance?
Whether or not an explicit agreement has been reached between them, an alliance is a connection between individuals, groups, or states that have come together for their mutual benefit or to accomplish some common goal. Allies are people who are a part of an alliance. Alliances can develop in a variety of contexts, including politics, the military, and business. Such associations may also be referred to as allies when the term is being used in the context of war as well as armed conflict, particularly when talking about World War I or World War II. Being perceived as an ally does not require a formal military alliance; rather, it only takes co-belligerence, or fighting alongside another person. This usage states that allies are formed when a war breaks out, not when an alliance treaty is signed.
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