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"China firmly opposes the US action and urges it to immediately stop such provocation," he said, adding that China will continue to take necessary measures to safeguard its sovereignty and security.

"China has already offered more market access to Indian companies, from IT and services to pharmaceuticals to Bollywood films," said Sang Baichuan, director of the Institute of International Business at the University of International Business and Economics in Beijing.

"Cash-constrained airlines will postpone their scheduled aircraft replacements. It is expected to be a long and slow recovery period after travel restrictions are lifted. As most aircraft are grounded, demand for flight hour and flight cycle-related maintenance has also disappeared," said Manfred Hader, senior partner of Roland Berger in Germany.

"China has over 90 percent of the world's sea buckthorns, while 70 percent is produced in Shanxi. Just in Kelan county, there are about 32,667 hectares of sea buckthorns. We hope to fully leverage the regional resources," Zhang said.

"But we need to pay attention to regulations and the worldwide discussion in this direction should be heard," said Qi, who left Tsinghua University earlier this year to take up his new post.