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In 2008, the first G20 summit was held in Washington, D.C., in the United States, and the group played a key role in the response to the global financial crisis.

"The current crisis is far more complex than any of the previous crises, and it can not be fixed overnight," said Xi, noting that a multi-pronged approach is required to overcome the crisis.

In view of the geographical proximity, frequent personnel exchanges and large trade volume, the three countries will jointly address the challenges of transnational crime to enhance social stability, the declaration said.

To this end, he required a management and operation system that integrates state leadership, coordination between the military and non-military sectors, as well as the market rules.

He also said China will continue to support and participate in South-South cooperation, advance pragmatic cooperation with developing countries and make joint efforts to promote economic development and improve people's livelihood.