China on Wednesday unexpectedly appointed a new trade negotiator key in any talks to resolve the escalating tariff war with the U.S., replacing veteran trade tsar Wang Shouwen with the Chinese envoy to the World Trade Organization.

Shares of Boeing fell Tuesday following a report that China has halted the delivery of all its jets to airlines in the country as part of the escalating trade war.

Beijing has suspended exports of certain rare earth minerals and magnets that are crucial for the world’s car, semiconductor and aerospace industries.