Opinion polls point to Viktor Yanukovych, the president's opponent in the 2004 race, but pollsters say none of the candidates is likely to garner the 50% plus one vote required to avoid a runoff.
Five people have formally registered as contenders, including Verkhovna Rada Speaker Volodymyr Lytvyn, ex-defense minister Anatoliy Hrytsenko and Communist leader Petro Symonenko.
The registration deadline is November 9.
Yushchenko addressed his supporters near the Central Election Commission building after he submitted the documents.
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