By Ryan Vlastelica NEW YORK (Reuters) - The European Union's antitrust probe into Google sparked a big rally in Russian search engine Yandex NV last week, even though the "Russian Google" still faces significant challenges, competitive and otherwise. Yandex has amassed a $6.54 billion market capitalization, mainly by selling advertising against the web browser used on 64 percent of Russian desktop computers. But it has lost market share as Russian consumers have adopted Android-based cell phones that come pre-loaded with Google products that compete directly with Yandex applications. ...



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