The United States has said "all options are on the table," after North Korea defied UN restrictions to launch ballistic missile and nuclear tests.
China has called on North Korea to suspend its missile tests, saying in return, South Korea and the US should halt joint military exercises.
China says the drills across the border in South Korea were increasing tensions and the use of the US system's powerful radars were seen as a security threat.
The US rejected China's proposal.
US military forces have already begun moving equipment for its controversial missile defence system known as THAAD to ally South Korea.
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