An attack within the next 12-18 months is a reasonable expectation.
The Taiwan Scenario
"Although the PLA [People's Liberation Army] is contending with a growing array of missions, Taiwan remains its main strategic direction. China continued modernizing its military in 2010, with a focus on Taiwan contingencies, even as cross-Strait relations improved. The PLA seeks the capability to deter Taiwan independence and influence Taiwan to settle the dispute on Beijing’s terms. In pursuit of this objective, Beijing is developing capabilities intended to deter, delay, or deny possible U.S. support for the island in the event of conflict. The balance of cross-Strait military forces and capabilities continues to shift in the mainland’s favor."
"China is modernizing its nuclear forces by adding more survivable delivery systems. In recent years, the road mobile, solid propellant CSS-10 Mod 1 and CSS-10 Mod 2 (DF-31 and DF-31A) intercontinental-range ballistic missiles (ICBMs) have entered service. The CSS- 10 Mod 2, with a range in excess of 11,200 km, can reach most locations within the continental United States."
In 2005, top-level Chinese army officer General Zhu Chenghu threatened America with nuclear war if America interfered with Taiwan:
"If the Americans are determined to interfere [then] we will be determined to respond. We ... will prepare ourselves for the destruction of all of the cities east of Xian [a city in central China]. Of course the Americans will have to be prepared that hundreds ... of cities will be destroyed by the Chinese."
And, as reported in 2006, Sha Zukang, the Chinese ambassador to the U.N., furiously and harshly threatened the U.S. over Taiwan. I transcribed the words that he literally screamed in an interview with a BBC reporter:
"The moment that Taiwan declares independence, supported by whomever, China will have no choice but to [use] whatever means available to my government. Nobody should have any illusions on that. ...
It's not a matter of how big Taiwan is, but for China, one INCH of the territory is more valuable than the LIVES of our people."
[With regard to the U.S.'s constant criticism of China's rapid militarization:] It's better for the U.S. to shut up, keep quiet. That's much, much better. China's population is 6 times or 5 times the United States. Why blame China? No. forget it. It's high time to shut up. It's a nation's sovereign right to do what is good for them. But don't tell us what's good for China. Thank you very much."
Secrecy and deception
China's military culture is completely opposite to America's in the sense that America tries to be as open as possible, while China tries to be as secretive and deceptive as possible until it attacks. This is described in the report:
"PRC [People's Republic of China] military writings point to a working definition of strategic deception as "[luring] the other side into developing misperceptions, and [establishing for oneself] a strategically advantageous position by producing various kinds of false phenomena in an organized and planned manner with the smallest cost in manpower and materials." In addition to information operations and conventional camouflage, concealment, and denial, the PLA draws from China’s historical experience and the traditional role that stratagem and deception have played in Chinese statecraft.
There is an inherent tension in Chinese strategic culture today, pitting a deep-seated tendency to conceal military capabilities and force development against a partial acceptance that excessive secrecy inflames regional and global anxiety about China’s rising power. For over a decade PRC leaders have identified the so called .China threat theory. as a serious hazard to the country’s international standing and reputation, threatening the development of a persistent alignment of regional and global powers in opposition to China. In addition, extreme secrecy is increasingly difficult to reconcile with China’s role in the integrated global economy, which depends upon transparency and the free flow of information for success.
There is perhaps another source of tension between the emerging reality of Chinese military power and China’s tradition of secrecy, and that is the fact that many of China’s new military capabilities are difficult or impossible to hide. Examples of such capabilities include advanced aircraft, long range missiles, and modern naval assets. Furthermore, missiles, space-based, and counterspace systems must be tested and exercised before being operationally deployed with confidence. The PLA’s growing inventory of these new assets and the ranges at which they operate effectively prevents their concealment."