Chinese experts are concerned that even a limited missile defense system could neutralize China’s fewer than two dozen single-warhead ICBMs that are capable of reaching the United States. “It is evident that the U.S. [national missile defense] will seriously undermine the effectiveness of China’s limited nuclear capability from the first day of its deployment,” said Ambassador Sha Zukang, the former director-general of the Department of Arms Control and Disarmament at the Chinese Ministry of Foreign Affairs. “This cannot but cause grave concerns to China,” he said.Some Chinese fear that, whether or not the U.S. missile defenses are as effective as planned, U.S. decision-makers could act rashly and risk a disarming first strike once the system is operational.

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Zhang, Hui. "Action/Reaction: U.S. Space Weaponization and China." Arms Control Today. Vol. 35, No. 10 (December 2005). [ 10 quotes ]