U.S. President Barack Obama returned here Saturday after a six-day European tour, during which he put on a show of "solidarity" while trans-Atlantic divergence may still run deep.Trying to forge a unified position on the unrestive Middle East and North Africa was high on Obama' agenda while he was in Europe, especially because the trip started only three days after his major policy speech on those issues.The United States has vital interests in that region while Europeans are sensitive to the developments there given the geographic proximity.After a two-day summit in the northern French resort of Deauville, Obama and other leaders of the G8 industrialized nations pledged 20 billion U.S. dollars in aid to Egypt and Tunisia through 2013 for their "suitable reform efforts."Of the total, 10 billion...