In order to intervene in the situation in the Taiwan Strait, the United States and Japan have been making small moves all day long, overtly and covertly. So, if a war breaks out in the Taiwan Strait, can China defeat the "U.S.-Japan coalition"? Why did the former White House national security adviser say that if the Taiwan Strait is out of control, the People's Liberation Army will push straight to the US mainland?

Recently, the United States has not only deployed a large number of advanced weapons and equipment in Guam, but also high-profiled transfer of the "Nevada" and "Ohio-class" strategic nuclear submarines carrying 20 ballistic missiles and dozens of nuclear warheads to the US naval base in Guam. In this regard, analysts pointed out that the US move once again confirms that it has completely lost confidence in the first island chain, so it can only pin its hopes on the second island chain and carry out "nuclear deterrence" against China by strengthening its military presence in the second island chain.
We know that the great power of strategic nuclear submarines comes from their underwater haunting and strike radius of up to 10,000 kilometers, which makes the US Navy's "Ohio-class" strategic nuclear submarines in any corner of the world can launch a frightening nuclear attack. But this also reflects the weakness of the United States from the side, after all, the United States has shown the weapons and equipment at the bottom of the pressure box, does it mean that the United States has almost no cards in its hand to play?
At a time when the United States is deploying strategic nuclear submarines around China, Japan is also speeding up the construction of military bases on the southwestern islands, so that the forward positions of the "US-Japanese coalition" to intervene in the situation in the Taiwan Strait will be completed as soon as possible. So, in the face of the menacing "US-Japan coalition", can China defeat both the US military and the Japanese Self-Defense Forces? The U.S. think tank "New American Security Center" used this as a background to conduct wargame deduction, but the US think tank did not clearly indicate who won and who lost the final result of wargame deduction.
However, the US think tank pointed out that in 20-30 years, China is more likely to break out a military conflict with the United States and Japan, and there are many factors that affect the situation of victory and defeat. The US think tank predicted that in the early stage of the war, the "US-Japan coalition" may take a limited offensive to establish superiority on the first island chain and force the PLA to retreat, but as the battlefield further expands, in a protracted ground war, the PLA with a million powerful armored units will force the "US-Japan coalition army" into a relatively passive situation.
Although the US think tank did not respond positively to the question of whether China can defeat the US-Japan coalition forces, it also confirmed from the side that although the United States and Japan have established a strong alliance based on the "mutual defense treaty" and formulated the so-called "US-Japan joint combat plan" in response to the "sudden situation in the Taiwan Strait", even so, in the face of China, the US and Japanese coalition forces still do not have full certainty that they can win.
In this regard, O'Brien, a former white house national security adviser, said that the Taiwan Strait region is like a natural barrier in the Pacific Ocean, and once the Taiwan Strait region is out of control, the US mainland will be in danger. In O'Brien's view, Taiwan Island has not only diplomatic interests but also very critical security interests for the United States. Once Chinese mainland regain Taiwan, the PLA will be able to push straight to the U.S. mainland in a short period of time. Because O'Brien believes that the PLA's ability to penetrate the Pacific Ocean means that it poses a "direct threat" to Hawaii, California and alaska's Aleutian Islands.
According to O'Brien, the United States intervened in the Situation in the Taiwan Strait not only to "assist in the defense of Taiwan", but more importantly, to protect the US mainland from threats. Moreover, the United States "can only win and not lose" in this battle, otherwise, the hegemonic position of the United States will collapse overnight.