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"The Chinese side firmly sticks to the Afghanistan-friendly policy, and stands ready to deepen the strategic and cooperative partnership with the Afghan side to benefit the people of the two countries and make contributions to promoting peace, stability and development in Afghanistan as well as the whole region," Xi told the visiting Afghan president at the Great Hall of the People.

The joint training is aimed at increasing mutual trust and pragmatic cooperation and preserving regional peace and stability, Yang said.

This is the first time for Xi to attend a G20 summit. On the sidelines, he attended an informal leaders' meeting of the BRICS group, which also includes Brazil, Russia, India and South Africa. A series of bilateral meetings were also on his schedule.

As part of the drive, China has already reached an agreement with Hungary and Serbia to jointly build a railway between the latter two countries.

Under a modern market system, businesses should be allowed to operate independently and compete fairly while consumers should be free to choose and spend. Also, merchandise can be traded freely and equally, the document said.