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Despatches from the BBC's foreign correspondents. This week: Paul Adams reflects on the Nato summit in Bucharest, where Russia’s President Putin was keen to sign autographs, but anxious to halt the alliance’s eastward expansion. Quentin Sommerville explains why trouble in Tibet and Beijing's suppression of dissent have soured China's Olympic party mood. Daniel Schweimler reports from Argentina, where a revolt by the country’s farmers has plunged the country into crisis. Jonny Hogg recounts how the ousting of Colonel Mohamed Bacar from his post as president of one of the Comoros islands turned i