"The Syrian regime and its Russian and Iranian allies are trying to obfuscate the truth. The world should not be fooled and the world will not forget," Obama told White House reporters at his final year ender news conference.
Around the world as well, there are hotspots where disputes have been intractable, conflicts have flared up, and people, innocent people are suffering as result, and nowhere is this more terribly true than in the city of Aleppo, he said.
The world, he said, is united in horror at the savage assaults by the Syrian regime and its Russian and Iranian allies on the city of Aleppo.
"We have seen a deliberate strategy of surrounding, besieging and starving innocent civilians. We've seen relentless targeting of humanitarian workers and medical personnel, and entire neighbourhoods reduced to rubble and dust. There are continuing reports of civilians being executed. These are all horrific violations of international law," the US President said.
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"We all know what needs to happen," he said, adding that there needs to be an impartial international observer force in Aleppo that can help coordinate an orderly evacuation through safe corridors.
"There has to be full access for humanitarian aid, even as the United States continues to be the world's largest donor of humanitarian aid to the Syrian people. And beyond that, there needs to be a broader ceasefire that can serve as the basis for a political rather than a military solution," Obama said.
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"So we are going to keep pressing the Security Council to help improve the delivery of humanitarian aid to those who are in such desperate need and ensure accountability, including continuing to monitor any potential use of chemical weapons in Syria," Obama said.
"We are going to work in the UN General Assembly as well, both on accountability and to advance a political settlement because it should be clear that although you may achieve tactical victories, over the long-term, the Assad regime cannot slaughter its way to legitimacy," he said.