Rome, May 21 - The European Union must back up its words on solving youth unemployment with strong actions, Italian Premier Enrico Letta said Tuesday. The EU must move rapidly to invest its energy into "policies for growth and jobs," Letta told the Senate, one day before an EU summit on the issue of growth and tax policy. Solving the crisis of rising youth unemployment must be an "absolute" priority, both for the economy and for the EU's credibility, he added. "The EU is in a crisis of legitimacy over the lack of results," on previous promises to deal with joblessness among European youth, Letta said. On Monday, Letta discussed issues of economic growth and youth unemployment in a telephone conversation with United States President Barack Obama.