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BEIJING, April 13 (Xinhua) -- Chinese Premier Li Keqiang has stressed that development is China's primary task, and is the key to "resolving problems."

Exercises based on defense and settlement of emergencies were also conducted to test the command system's response and soldiers' combat skills.

"China and the rest of the international community are very worried about the missing flight, as its whereabouts still remain unknown," said the spokesman, who urged Malaysia not to miss any clues and to speed up search efforts.

Russia vetoed the draft resolution, drawn up by the United States and backed by Western countries, that declared that a planned referendum slated for Sunday on the status of Ukraine's Crimea region "can have no validity" and urged nations and international organizations not to recognize it.

His remarks highlighted the safety in coal mines, road transportation and oil and gas pipelines, which need regular checks and fire-fighting measures, especially for construction sites, crowded places and underground locations.