KUALA LUMPUR (Reuters) - Greece needs a lasting solution to its debt burden to avoid a prolonged crisis as Europe's slowdown and U.S. fiscal problems dampen the economic outlook in Asia, International Monetary Fund Managing Director Christine Lagarde said on Wednesday. The IMF expects a "real fix" for Greece that puts its debt on a sustainable path as quickly as possible, Lagarde said, showing no signs of backing down in a clash with the EU over how Athens can bring its debt down to a sustainable level. ...