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German enterprises have grasped the opportunities of China's new round of reform and opening-up, said Xi.

In 2017, China's airports handled 552 million passenger trips, and the figure is expected to reach 720 million by 2020.

The third step will see the air force fully transformed into a world-class force by mid-21st century, according to Xu.

Xi's visit will be a fresh starting point for the comprehensive strategic partnership between the two sides to open a new chapter.

Putin also said it is very important that Russia and China maintain regular top-level communication, adding that he looks forward to meeting Xi again on the sidelines of the Group of 20 summit to be held soon in Buenos Aires, Argentina.