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The tortuous process of nailing down a trilateral foreign ministers' meeting nine years after the first of its kind was held in 2007 implies that differences on regional issues have been haunting relations among China, Japan and South Korea.

Bulgaria is willing to further enhance exchanges at different levels and cooperation in various fields with China, said Plevneliev, adding that his country supports deepened cooperation between CEE countries and China.

The two neighbors have always understood, respected and supported each other, he said.

"Both sides should bolster their sense of responsibility and crisis awareness, and work to build on the positive elements of bilateral ties while putting a lid on negative ones, in order to ensure stable improvement of relations," Xi said.

Liu hoped that the first group of Schwarzman scholars will value the opportunity, promoting cultural exchanges between China and other countries, and cooperating to face the global challenges.