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BEIJING, April 24 (Xinhua) -- China is open to space cooperation with all nations including the United States, the heavyweights of China's space program said on Sunday, the anniversary of China's first satellite launch 46 years ago.

"Although the economy operated steadily in the first quarter, with improvements in structure and quality and better-than-expected indicators, downward pressure remains considerable and the foundation for economic stabilization and improvements has yet to be consolidated," said Li.

Over the past decade, China has gradually formed a foreign policy that treats "major power relations as the key aspect, relations with the neighboring countries as the top priority, relations with developing countries as the foundation, and multilateral diplomacy as an important arena."

"As for illegal entry by DPRK citizens, China will always properly handle the issue in line with international and domestic law as well as humanitarian principles. That's our established policy," Lu added.

The U.S. Navy has several times sailed guided missile destroyers within China's territorial waters, and held frequent large-scale drills with its allies in the South China Sea, flexing its military muscles.