American military action is being considered only in response to an attack by Pyongyang, the secretaries of defense and state said.
Some see Beijing pressure behind the resentencing of the three activists, who took part in the Umbrella Movement.
Tensions are higher than at almost any time since the two coutnries went to war in 1962.
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Three schools were vandalized this weekend in Melbourne.
First global survey released under President Trump is critical of Iran, Saudi Arabia, China, Pakistan, Turkey.
The young man's body was covered with bruises, his parents told Chinese media outlets.
Beijing warned the U.S. not to split an international coalition by starting a trade war.