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BEIJING, June 7 (Xinhua) -- China and the United States agreed to closely cooperate under the G20 framework to boost the world economy, a senior Chinese official said Tuesday.

The Chinese president welcomed Modi's scheduled attendance at this year's G20 summit in Hangzhou, capital of east China's Zhejiang Province, adding that he is looking forward to participating in this year's BRICS summit in India in October.

The Serbian foreign ministry said in a press release late Tuesday that the country supports interested parties in the South China Sea to have a dialogue.

The book documents all major developments in Nepal-China relations since the two countries established diplomatic relations in 1955.

CTBT is seen as a key part of the non-proliferation regime in the international norm, which would monitor and prohibit the nuclear test worldwide, and China has always been promoting the entry-into-force of the treaty.