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Li is here after a transit visit to Ireland. Brazil is the first stop of Li's four-nation Latin America tour, his first to the region since he assumed premiership in 2013. Besides Brazil, Li will also visit Colombia, Peru and Chile.

Kerry said that the U.S. side appreciates China's important and constructive role in the new round of nuclear talks.

China, he said, is ready to launch long-term and stable energy cooperation with Iran, and expand bilateral cooperation in such areas as high-speed railway, road, building materials, textile, telecommunication, electricity and engineering machinery, so as to dovetail the two countries' advantageous industries, fine resources and strong markets.

Premier Li called on both sides to facilitate negotiations on a bilateral investment treaty (BIT) to reach a "high-level and balanced" agreement at an early date.

Cheng Jingye, China's envoy to the International Atomic Energy Agency, will attend the negotiations, Hua Chunying announced at a regular news briefing.