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Xi, general secretary of the Communist Party of China Central Committee and chairman of the Central Military Commission, said this in an instruction while he is visiting foreign countries.

"If the United States act willfully and puts its additional tariff measures into effect, China will instantly implement such tariff measures," the commission said.

"We should bear in mind the big picture of BRICS cooperation, constantly cement our strategic partnerships, make a loud and clear voice on upholding multilateralism, and jointly build an open world economy," Xi said, while pledging to coordinate with and support South Africa for a successful BRICS summit.

Noting that innovation cooperation is a highlight of China-Israel relations, Cai said Xinhua is willing to make joint efforts with Israel to increase media coverage in the high-tech and innovation fields, so as to advance the innovative comprehensive partnership between the two countries.

Mattis said that guided by consensus reached by heads of state of the two countries, the United States is willing to strengthen strategic communication, expand mutually-beneficial cooperation, manage and control differences and risks, and prevent conflicts and confrontations, so as to enable military relations to be a constructive factor in promoting the development of bilateral ties.