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The NSA has planted backdoor software in around 100,000 computers worldwide since 2008, giving it the capability to monitor them around the clock, as well as launch attacks. The agency can access and control these computers using radio waves even if they are not connected to a network.

"The dialogue gives both sides a good chance to talk and try to build trust to one another ... What China and the U.S. can do mutually together will in the future lay the ground for international cooperation for others to follow," he said.

Premier Li said countries now live in an era defined by deepening economic globalization and are increasingly depending on one another in interests and sharing their destinies closely.

Chinese experts will help train local medical workers and assist Chinese embassies in these countries to distribute medical supplies, said Sun Hui, a member of the medical teams.

The meeting has reached consensus on the legal documents about SCO expansion, passing in principle two draft documents on expansion for the approval by the SCO summit to be held here in September, he said.