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Around 31.1 percent of Beijing's renewable energy came from solar power last year, the biggest source.

As a country that follows a strategy of trade for growth, Singapore puts connectivity as priority, said Teo.

"The larger transport corridor connects Central Asia and Europe to the west, and ASEAN members to the south, further linking South Asia, the Middle East and Australia," said Zhai Kun, professor of international relations at Peking University. "All the countries and regions along the corridor can thus share capacity and market."

The two leaders signed an action plan for bilateral innovation cooperation from 2018 to 2021 and witnessed the signing of seven other documents.

In today's world, it was of great significance for China and Russia to strengthen collaborations and work with other countries in safeguarding multilateralism, international law and free trade system, he added.