US President Barack Obama on Friday announced he would push for a nuclear-free world at Sunday's summit with the European Union (EU) leaders.
"The spread of nuclear weapons, or the theft of nuclear material, could lead to the extermination of any city on the planet," Obama told an audience of young people at a town hall meeting in Strasbourg.
"This weekend in Prague, I will lay out an agenda to seek the goal of a world without nuclear weapons," Obama said ahead of a summit of NATO leaders in the French city and in Baden-Baden, Germany.
The comments came two days after Obama and Russian President Dmitry Medvedev agreed to draw up a new deal on nuclear disarmament during a meeting in London.
The two leaders said they would seek a replacement to the current US-Russian strategic weapons reduction programme (START), which expires at the end of 2009.