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VILNIUS, June 20 (Xinhua) -- Chinese Vice Premier Zhang Gaoli arrived here Saturday for a visit intended to promote development of cooperation between China and Lithuania, including Lithuania's possible participation in China's Silk Road Economic Belt initiative.

Russia and China should maintain close communication and coordination, jointly cope with challenges, and safeguard world peace, stability and development, they said.

"Cyber attacks conducted across countries are hard to track and therefore the source of attacks is difficult to identify. Jumping to conclusions and making hypothetical accusation is not responsible and counterproductive," Zhu Haiquan, a spokesman for the Chinese Embassy in the United States, said in a statement.

He said that the SCO should continue to expand external exchanges with other regional and international organizations, and improve the dialogue and cooperation mechanism with its observers and dialogue partners.

He said that the South China Sea should not have become an issue between Beijing and Washington in the first place, because Washington is not one of the claimants. He reiterated that China's construction activities in the region fall well within the scope of its sovereignty.