The three European Union leaders in Norway to collect the Nobel peace prize moved Sunday to defuse criticism of the 2012 award, vowing the crisis-hit bloc would emerge strong and remain on a course of peace. "Europe is going through a difficult period," EU president Herman Van Rompuy told a packed news conference on the eve of the awards ceremony.

"We are working hard, jointly as a union and in all individual countries, to overcome these problems," he added.

"I'm sure we will succeed. We will come out of this time of uncertainty and recession stronger than we were before." Van Rompuy was speaking in eurosceptic Norway, a country stubbornly opposed to joining the bloc.

As protests and job cuts traumatise Europe after three years of dire economic crisis, the Nobel Committee has come under attack for its decision to commend the EU for turning a continent at war into a continent at peace.

But the Nobel Committee chairman, the ardently pro-European Thorbjoern Jagland, justified the choice by the absence of conflict on a scale seen in the two world wars of the 20th century.

"The disputes and dramas have never led to war. On the contrary they have led to compromises,"

But highlighting the strain building as the EU weathers its worst crisis in 60 years, half a dozen leaders, including Britain's premier David Cameron, will snub Monday's ceremony. "We want Europe to become again a symbol of hope," Van Rompuy added.

Copyright Agence France-Presse, 2012