The U.S. Defense Intelligence Agency has been warned Beijing's modernized forces "will enable China to impose its will."
"The Taiwan issue is a matter of China's internal affairs," General Li Zuocheng said.
Beijing and Washington vie for influence in the Asia-Pacific as China presses strategic regional goals.
The country's pacifist constitution has long prevented governments from attaining carriers.
Disagreements on an array of issues, exacerbated by political incentives to avoid compromise, raise a persistent risk of military crisis.
"If you are friends with two countries which are on different sides, sometimes it is possible to get along with both, sometimes it's more awkward when you try to get along with both," Prime Minister Lee Hsien Loong warned.
It was a close shave in the South China Sea.
Ben Hodges spoke of "an increasingly tense relationship and increasing competition in all the different domains."
They were left floating on the wreckage for five days.
There are 261 joint exercises scheduled for this year, which will increase to 281 in 2019.
"We will take all necessary means to safeguard our rights and interests," said a Chinese Defense Ministry spokesman.
Around 5 million people are in the path of the super typhoon's 180-mile-per-hour winds.
China says it may not give the U.K. a good post-Brexit trade deal.
A new report says Chinese nuclear-capable bombers are "likely training for strikes against U.S. and allied targets."
Beijing sent a U.S. navy plane six warnings to turn away from the South China Sea last week.
Xi warned Mattis on Wednesday that China "cannot lose even one inch of the territory left behind by our ancestors."
The president had already approved 33 different projects to upgrade and modernize military capacities.
The missiles reappeared in "exactly" the same position as where they were prior to disappearing.
China says it "won't be scared" after the U.S. flew two B-52 bombers over the Spratly Islands on Tuesday.
Lieutenant General Kenneth McKenzie said the U.S. would continue to conduct operations around the Chinese bases despite criticism from Beijing.
A Chinese Foreign Ministry official likened U.S. complaints about China's militarization of the South China Sea to "a thief crying 'stop thief.'"
Chinese-American relations in Asia have been strained by Beijing's increasingly determined military policy, especially in the South China Sea.
Duterte has recently faced criticism for his silence about China's increasingly aggressive posture in the disputed waters.
The Chinese Defense Ministry said "it is impossible to shake China's determination to safeguard its sovereignty and security interests."
The "Big Three" of China's seven man-made islands Subi, Mischief and Fiery Cross all host a range of military infrastructures, satellite images show.
"China's continued militarization of disputed features in the South China Sea only serve to raise tensions and destabilize the region," the Pentagon said.
Only the U.S., Russia and some European Union countries have such advanced stealth capabilities.