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Clean energy development is crucial to the improvement of energy structure, energy security and the promotion of "ecological civilization," Xi said in the letter.

Closer regional economic integration

Chung Eui-yong, top national security advisor to President Moon, chaired the meeting for about an hour earlier in the day.

Chinese tourists are already an important consideration for global tourism agencies and they will become more so in future, with the number of Chinese people holidaying outside China expected to double to 200 million by 2022 from 2016's total.

Closer ties will create solid foundation for economic vitality, says official