Barack Obama has accepted his Nobel peace prize in Oslo, with the US president insisting he was 'at the beginning and not the end' of his labours on the world stage.
He formally received the award at a ceremony in the Norwegian capital's City Hall this afternoon, nine days after he announced a decision to send a further 30,000 troops to Afghanistan and just ten months into his presidency.
'I receive this honour with deep gratitude and great humility; it speaks to our greatest aspirations,' President Obama said in his acceptance speech.
'We are not prisoners of fate, our actions matter.'
Obama was named as the winner of this year's peace prize several months ago, with many criticising the decision to award it based on his potential and commitments rather than achievements.
'I cannot argue with those who claim others are far more deserving of this honour than I,' he said.
The White House had already said President Obama's speech would attempt to justify the Nobel committee bestowing the honour upon the leader of a country engaged in wars in Afghanistan and Iraq.
'I am the commander-in-chief of nation in the midst of two wars,' Mr Obama accepted.
'We are at war, I am responsible for the deployment of thousands to a distant land, some will kill, some will be killed. So I come with an acute sense of the cost of armed conflict.'
On the coalition in Afghanistan the president commented: 'America's commitment to world security will never waver but we can not act alone, America alone can not secure peace.
'We must acknowledge the hard truth,' Mr Obama continued. 'That there will be times when nations will find the use of force necessary and morally justified.
'Those who break the rules must be held accountable. The world must stand as one.'
Mr Obama said diplomacy was his preferred route of engagement but that in areas where it broke down, 'there must be consequences when those things fail'.
He said free speech was a direct route to peace and that religious intolerance only led to conflict.
Burma, Iran and Darfur were all referenced directly by the president, who failed to criticise more powerful nations such as China, Russia and Saudi Arabia on their poor human rights records.
'Oppression will always be with us but we can still strive for justice, we can acknowledge there will be war but we can strive for peace.'
Much had previously been made about President Obama's decision to stay in Oslo for less than 24 hours, meaning he will miss out certain traditional elements of the ceremony. He flew in this morning and will leaving tomorrow morning. The official ceremony is usually spread over three days.
He has declined the traditional lunch with the King of Norway and will not attend a concert in his honour nor hold a press conference. In Norway his fleeting visit has been seen by many as a snub but public relations experts say it is a deliberate tactic to keep a low profile.
Speaking at a press conference with President Obama earlier today, Norwegian prime minister Jens Stoltenberg said his Nobel prize was 'well deserved and an important award'.
'I can not think of anyone else who has done more for peace,' he said, adding it represented a 'bold and important decision'.
When the Nobel committee announced President Obama as this year's laureate it praised 'his extraordinary efforts to strengthen international diplomacy and cooperation between peoples' and cited his push for nuclear disarmament and his outreach to the Muslim world.
The award comes with prize money of ten million Swedish crowns, about £860,000, which the White House has said will be donated to charity.
