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Russian President Dmitry Medvedev takes his plea for foreign investment and technology directly to Microsoft Corporation (NASDAQ:MSFT), Citigroup Inc. (NYSE:C) and Nokia Oyj as he hosts business leaders this week in his native St. Petersburg. A year and a half after Prime Minister Vladimir Putin rejected Dell Inc. Chief Executive Officer Michael Dell’s offer to assist Russia’s computer industry at the World Economic Forum in Davos, Medvedev will ask investors to help build a Russian “Silicon Valley” to cut the country’s oil addiction. “Medvedev is on a very serious marketing campaign right now,” said Jack Barbanel, managing director at Moscow-based Strategic Investment Group, which focuses on technology and healthcare in the former Soviet republics. “It’s a major change because previously Russia wasn’t doing much.” –Bloomberg Wal-Mart Stores (NYSE:WMT) will…