It appears that I wasn't entirely correct. This is the reason given in Wikipedia:
The Allies had agreed to mark May 9, 1945 as V-E day, but Western journalists broke the news of Germany's surrender prematurely, precipitating the earlier celebration. The Soviet Union kept to the agreed date, and Russia and other countries still commemorate the end of the Second World War, a significant part of which is known as the Great Patriotic War in Russia and other parts of the former Soviet Union, as Victory Day on May 9.
O.
The Allies had agreed to mark May 9, 1945 as V-E day, but Western journalists broke the news of Germany's surrender prematurely, precipitating the earlier celebration. The Soviet Union kept to the agreed date, and Russia and other countries still commemorate the end of the Second World War, a significant part of which is known as the Great Patriotic War in Russia and other parts of the former Soviet Union, as Victory Day on May 9.
O.
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