Answer:
stop its expansion into Western Europe.
Explanation:
Adolf Hitler claimed the region of Sudetenland and provoking the people of Czechoslovakia to unite with their homeland(Germany). The war with Czechoslovakia was seen unavoidable. Britain and France intervened in the situation as they were having a pact with the Czechoslovakian government. The announcement of Hitler that it would be his last territorial claim in Europe and to avoid war at any cost, France and Britain signed the Munich Agreement on 30 September 1938, with Germany and Italy to allow the annexation of Sudetenland by the German Forces.
Toward the end of the Tang Dynasty, the government faced a series of rebellions in the outer areas of the empire.
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Russia experienced food and fuel shortages
Estonia, Latvia and Lithuania cannot really trust Russia (the leader of the Commonwealth of Independent States) as Russia forcibly made those states part of the Soviet Union and and did allow for democracy there. That's why they don't want to be part of CIS. They can afford not to be due to their location in Europe, next to western Europe, so then can claim help from western Europe in case of Russian Invasion (unlike Kazakhstan for example).