“If the Americans draw their missiles and position-guided ammunition on to the target zone on China's territory, I think we will have to respond with nuclear weapons,” Zhu Chenghu, a major general in the People's Liberation Army, said at an official briefing.

Mr Zhu, who is also a professor at China's National Defence University, was speaking at a function for foreign journalists organised, in part, by the Chinese government. He added that China's definition of its territory includes warships and aircraft.

“If the Americans are determined to interfere [then] we will be determined to respond,” Mr Zhu said. “We Chinese will prepare ourselves for the destruction of all of the cities east of Xian. Of course the Americans will have to be prepared that hundreds. . . of cities will be destroyed by the Chinese.”

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