During the August coup in the U.S.S.R., Estonia was able to maintain constant operation and control of its telecommunications facilities, thereby offering the West a clear view into the latest coup developments and serving as a conduit for swift Western support and recognition of Estonia's "confirmation" of independence on August 20, 1991. August 20 remains a national holiday in Estonia because of this. Following Europe's lead, the United States formally reestablished diplomatic relations with Estonia on September 2, and the U.S.S.R. Supreme Soviet offered recognition on September 6.
(Taken from Wikipedia, History of Estonia)
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