Mr Annan warmly congratulates President Obama on his Nobel Peace Prize. It was an unexpected but inspired choice.
In an increasingly challenging and volatile world, President Obama has given a sense of hope and optimism to millions around the world.
President Obama has already demonstrated a commitment to a nuclear free world, to international cooperation and solidarity, to the respect of the rule of law, and has joined the fight against climate change. He has shown that the only way forward is through genuine cooperation with other nations.
I am confident that he will continue to bring his skill and leadership to the many pressing issues that face our complex world.