(CNN) - German Chancellor Angela Merkel said Thursday that trust between Europe and the United States must be "reestablished" after claims the U.S. National Security Agency eavesdropped on her cell phone.

Merkel commented as she arrived at a summit of European Union leaders in Brussels, Belgium, which risks being overshadowed by anger about allegations the United States has been spying on its allies.

London (CNN) - WikiLeaks founder Julian Assange urged the world Saturday to "stand with" Edward Snowden, the man who admitted leaking top-secret details about U.S. surveillance programs, according to the text of a speech posted on Twitter.

As he appealed for a "brave country" to step forward and offer Snowden asylum, Assange also accused U.S. President Barack Obama of betraying a generation of "young, technically minded people."