China has put its military "on high alert" over North Korea's increased threats about a preemptive strike, CNN reported.
An unnamed defense official told CNN a large number of Chinese military aircraft are being brought up to full readiness through intensified maintenance to "reduce the time to react to a North Korea contingency."
CNN also reported China is now the focus of the Trump administration's North Korea strategy.
"Nobody thinks the Chinese are going to press North Korea militarily or bring the regime to its knees, but the strategy looks to China to find a political solution more than anything else," one senior administration official told CNN.
The United States is also prepared for a preemptive strike against North Korea, NBC News reported.
According to NBC News, the United States has positioned two destroyers capable of shooting Tomahawk cruise missiles in the region, one just 300 miles from the North Korean nuclear test site.
American heavy bombers are also positioned in Guam.
Earlier this week, the Pentagon announced the USS Carl Vinson aircraft carrier strike group was being diverted to the area.