Obama speaks at Nato summit
21 May 2012 Last updated at 19:58 BST
Leaders from more than 50 nations have been meeting to discuss the future strategy for Afghanistan.
President Obama has reassured Afghanistan that it will not be left on its own after NATO hands over responsibility for the country's security to Afghan forces in 2014.
The nations represented at the summit include heads of state and governments from the 28 Nato countries, along with Afghan President Hamid Karzai and Pakistani President Asif Ali Zardari.