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"China and Chinese people are Serbia's best friends," he added.

"China needs to continue its opening to the world, including important programs like the Belt and Road Initiative, while also promoting domestic-based growth to improve people's livelihoods and living conditions," said Sachs, who is also a senior United Nations advisor.

"China needs to prevent the Trump administration from replacing the bilateral, multilateral and global trade rules with unilateralism on trade," the former vice-minister of commerce told China Daily on Sunday.

"China is well-placed to help lead that effort," Sachs said. "China's advances in green and digital technologies are beneficial not only for China but for the whole world, such as the deep reductions in the costs of renewable energy and 5G," he said.

"But that's got to be balanced out with the population pressures, which particularly Sydney and Melbourne are feeling."