Smile Power: World Leaders Pose for Photo at NATO Summit

From left, Britain's Prime Minister David Cameron, President Barack Obama and NATO Secretary General Anders Fogh Rasmussen arrive for the family picture at the start of the NATO 2014 summit at the Celtic Manor Hotel in Newport, South Wales, on Sept. 4, 2014. LEON NEAL / AFP - Getty Images

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Amid handshakes and smiles, world leaders assembled Thursday for the traditional "family photo" as the NATO summit kicked off in Wales. Billed as the most important since the end of the Cold War, the summit got underway with calls to stand up to Russia over the Ukrainian crisis and confront Islamic State extremists.

ABOVE: President Barack Obama talks with NATO Secretary General Anders Fogh Rasmussen as they arrive for the photo.

President Barack Obama, bottom center, waves during a group photo opportunity at a NATO summit on the grounds of the Celtic Manor Resort in Newport, Wales, on Sept. 4, 2014.Jon Super / AP