Obama's talk on nukes at Hiroshima to clash with reality

There is the soaring rhetoric. And then there's the messy reality.

When President Obama and Japanese Prime Minister Shinzo Abe make an historic visit to Hiroshima on Friday -- the first time a sitting U.S. president has visited the site of the first atomic bomb attack -- their words advocating nuclear disarmament will clash with real-world security necessities.

Far from backing up the vision of a world without nuclear bombs that Obama laid out in a 2009 speech that helped secure a Nobel Peace Prize, his near-finished presidency has seen a multibillion-dollar modernization of the U.S. nuclear force.

Watching from the audience will be at least three Japanese survivors of the U.S. nuclear attacks, according to the Kyodo news agency.