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"China's role is essential," said Jon Taylor, professor of political science at the University of St. Thomas in Houston. The visit to Beijing and the Xi-Kim meeting has "reinforced China's role as a central actor in managing security issues in Northeast Asia in general and the Korean Peninsula in particular", he said.

"Consumer demand for gold products was weakened in the face of a surging gold price last year and an economic slowdown," said Alistair Hewitt, head of market intelligence at the World Gold Council.

"Cross-border e-commerce into China will probably play a bigger role this time, although at the end of the day it targets the same group of customers as domestic sales," said Richard McKenzie, a partner at consultancy Oliver Wyman.

"Chinese investment does have the potential to address Africa's infrastructure gap, but its approach has led to mounting debt and few, if any, jobs in most countries," he said before leaving for a five-nation trip that includes Chad, Djibouti, Ethiopia, Kenya and Nigeria.

"Chinese cities have been innovated in a way that has never been done anywhere in the world. There were no models and this cannot be learned from the West. The West has never done anything similar－to accommodate such a large migrant population in such a short time."