President Xi Jinping greets US President Barack Obama on the sidelines of the UN climate conference near Paris on Monday.[Photo by EVAN VUCCI/AP]

China and the United States pledged to manage differences and sensitive issues in a constructive manner on Monday, in addition to commitment to a climate change agreement at the international talks in Paris.

Observers said the world's two largest economies are setting maintenance of a sustainable relationship as the bottom line when their core interests conflict.

President Xi Jinping, speaking during a meeting with US President Barack Obama on the sidelines of the two-week UN climate conference in Paris, said that mounting global concerns have made relations between China and the US more important, and that the steady growth of the relations is important.