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David Cameron and Barack Obama have spoken via telephone about the global refugee crisis and the ongoing conflict in Syria, the White House has said in a statement.
Mr Obama and Mr Cameron reaffirmed their commitment to defeat the so-called Islamic State, reach a political transition to end the conflict in Syria and the need to focus on climate change ahead of the upcoming international conference in Paris.
With just 10 weeks to go until the Scottish vote on independence, David Cameron visited Scotland to appeal for a 'United Kingdom'.
Debi Edwards, ITV News Scotland correspondent, reports from both sides of the campaign:
UK Ambassador to the UN Sir Mark Lyall Grant has explained why Britain abstained on the vote on granting Palestine upgraded status at the UN:
David Cameron said he wanted to make it "absolutely clear" to the Argentine President that Falkland Islanders "have decided to hold a referendum about their future and if she believes in democracy, if she believes in self-determination, she should respect the outcome of that referendum".
The President of Argentina did not seek out Prime Minister Cameron.
Prime Minister Cameron approached first to talk about the economy and when the Argentine president was talking about the European crisis and the economy, he interrupted her and changed the subject.
This is a meeting to talk about the European crisis. The one that came forward trying to talk about an issue that wasn't on the agenda was Prime Minister David Cameron.
The Prime Minister David Cameron will talk about his frosty exchange with Christina Fernandez de Kirchner shortly.
Shortly, after a bilateral meeting at the G20 summit with the Indonesian President, he will refer to the moment earlier when he asked the leader of Argentina to accept the decision of the Falkland Islands to hold a referendum on their future sovereignty.
Downing Street aides said the David Cameron sought out Ms Kirchner to make Britain's position on the Falklands clear.
I am not proposing a full discussion now on the Falklands but I hope you have noted that they are holding a referendum and you should respect their views.
We should believe in self-determination and act as democrats here in the G20.
Aides said Mr Cameron gave a "clear and calm message" which he repeated three times as his words were interpreted into Spanish.
Ms Kirchner was said to have responded with "ramblings" as she tried to hand the PM a package marked "UN - Malvinas", but Mr Cameron walked away.