China is "seriously concerned" about the U.S. Golden Dome missile defence shield project and urged Washington to abandon its development，a foreign ministry spokesperson said on Wednesday.

Trump estimated the Golden Dome project to cost $175 billion, with a $25 billion down payment. A recent Congressional Budget Office estimate put the total cost of deploying and operating a constellation of space-based interceptors for 20 years at anywhere from $161 billion to $831 billion.