Leaked internal military documents said China has secret plans to invade Taiwan by 2020.
"War is not far from us... China cannot afford a military failure," wrote the PLA Daily as President Xi Jinping called for the military to demonstrate heroism and a fighting spirit.
A Chinese general facing corruption charges committed suicide in November.
He works 12 hours a day—even as an octogenarian, reports said.
China has one of the most powerful militaries in the world.
"All countries in this region who want to see peace and stability, have a consensus ... and China can't ignore this."
Russia is fortifying its massive military along two tense boundaries in its farthest western and eastern corners.
The U.S. is widely considered the world's top military power, but Russia and China are rapidly improving together and North Korea has achieved historic success.
China and Russia have urged a peaceful solution to the nuclear crisis with North Korea, but if the U.S. invades, they're preparing to fight.
Both countries share land borders with Kim Jong Un's secretive state.
"NATO needs to take note of the enormity of China's influence," a former NATO and U.S. military leader said.
"As power is shifting away from the West toward Asia, the West's ability to influence the agenda on a global scale is expected to be reduced," the latest NATO report found.
China revealed it's building the world's fastest wind tunnel only a month after offering a glimpse of its new hypersonic DZ-ZF missile glider.
The DF-26 "Guam Killer" is China's first nuclear-capable ballistic missile that could reach the U.S. territory already threatened by North Korea.
Chinese President Xi Jinping is calling for a world-class military and leading economy, but the U.S. is suspicious of Beijing's growing ambitions in world affairs.
General Joseph Dunford, chairman of the Joint Chiefs of Staff, said China's rapid military reforms and economic growth threaten U.S. hegemony.
Chinese sailors docked in Russia with a 21-gun salute as the two countries begin sea drills in the Russian region bordering North Korea.
China's new military base is just a few miles from the only permanent U.S. outpost in Africa.
The Chinese navy closes off 15,000 square miles in the East China Sea to perform live-fire drills as the U.S.-North Korea rivalry escalates.
The base is in Djibouti, where the United States has its only permanent military base in Africa.
China's Haiyi (or "Sea Wings") unmanned underwater glider has broken world records and can instantly detect U.S. submarines in the tense South China Sea.
The largest army in the world is readying for a "potential crisis."
The U.S., Russia and China are all looking to surpass each other with military innovations such as missiles and drones that use artificial intelligence.
China and India also denied reports that 158 Indian troops were killed during recent Chinese military action in the tense border dispute.