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BEIJING, April 14 (Xinhua) -- Chinese vessels have covered about 628,000 square kilometers in the southern Indian Ocean by midday Monday in search of the missing Malaysian flight MH370, said the China Maritime Search and Rescue Center.

The navy would reinforce communication with authorities and keep adjusting the search, he said.

Xi arrived in this Russian resort city earlier Thursday to attend the opening ceremony of the 22nd Winter Olympic Games. The three-day visit is his first foreign trip this year.

"I believe as long as the two governments and our friends from the business circles in both countries keep a firm belief and seize the opportunities, the trade and economic cooperation between China and the Netherlands will make fresh achievements, serving the interests of the two countries and peoples in a better way," Xi said.