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Designers have also developed an array of civilian versions of the CH family. The CH-3 has variants that can fulfill geological and mineral inspection, environmental monitoring and disaster analysis. The larger CH-4 armed drone has unarmed versions capable of executing extended long-range marine surveillance and emergency communications.

Democratic 2020 U.S. presidential candidate Senator Bernie Sanders follows former South Bend Mayor Pete Buttigieg off stage at the conclusion of the 10th Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, US, Feb 25, 2020. [Photo/Agencies]

Demand could be strong enough that smaller investors putting up just 0 million - the floor for investments, according to two people - would have to prove they could help the logistics unit to bring in new business, one of them said.

Delivering a welcome speech at the symposium's opening session, Alice Gast, president of Imperial College London, stressed the importance of scientific collaboration and cooperation among universities and other international institutions around the world to overcome the pandemic and other global challenges.

Despite the friendly atmosphere of the July summit, bilateral ties have not improved much. In August, Washington imposed a new round of sanctions against Russia and warned of the possibility of another round of stern restrictions in November. Moscow, in turn, vowed retaliation.