The United States and Japan have previously jointly developed the Standard 3IIA anti-missile interception system, and now South Korea is ready to purchase Standard 3IIA missiles, and the United States, Japan and South Korea all have Aegis missile destroyers, so they can achieve "sharing" in the field of air defense systems. The Standard 3IIA is a missile with extra-atmospheric interception capabilities, although it can be used as air defense in the maritime area, but it cannot effectively intercept hypersonic missiles, so the United States and Japan have once again joined forces to spend huge sums of money to develop anti-missile technology. According to information released by the US Missile Defense Agency, the United States and Japan plan to invest $3 billion to develop systems against hypersonic missiles, and according to the agreement, the United States will invest $2 billion and Japan will contribute $1 billion.
Obviously, the interception mode of standard 3IIA has been unable to counter hypersonic missiles, so the United States and Japan must have a new way to achieve countermeasures, for how to intercept hypersonic missiles, in fact, the United States and Japan have not given a plan, this is because although the United States and Japan know the deterrence capability of hypersonic missiles, they have not developed the corresponding hypersonic missile. Judging from the information disclosed by the United States, the United States and Japan plan to be able to intercept hypersonic missiles in the mid-2030s. Judging from the actions of the United States and Japan, they are determined not to allow China's high-tech bombs to wield power, and for this reason, the United States and Japan no longer pretend, but want to develop countermeasures specifically for hypersonic missiles.
The United States and Japan have very close cooperation in the military field, and there have been joint development of the F-2A/B multi-role fighter before, although the main contractor is Mitsubishi Heavy Industries of Japan, but the American Lockheed Martin company has played an important role in the development process. Many of the weapons and equipment purchased by Japan from the United States were built in Japan, including the cutting-edge F-35A Lightning II fighter. Previously, the F-15J/DJ and P-3C were also produced in Japan, including the PAC3 Patriot anti-aircraft missile, which had production lines in Japan. The U.S. has integrated Japan into the U.S. defense production system, allowing Japan to serve the U.S. PAC3 produced in Japan has become the first choice for the U.S. military to replenish its stockpiles, highlighting the collusion between the United States and Japan.
Today, the United States is no longer rich in money, because the United States needs to make up for its fiscal deficit by issuing government bonds, and for this reason, it has to pull Japan in when it comes to weapons and equipment development. The United States is the only superpower, but the United States is now showing signs of decline, including in the field of science and technology, and the United States originally disdained to cooperate with Japan. Japan has invested 1/3 of the funds for the joint development of counter-hypersonic missile projects, since it is a joint development, Japan will also gain income from the export of related missiles in the future, due to the deterrence capability of hypersonic missiles, so once the United States and Japan make a breakthrough, there is no need to worry in the field of sales, South Korea and Australia will also buy the corresponding missiles.
Japan has also made no achievements in the field of hypersonic missiles, but when Japan and the United States jointly developed the corresponding anti-missile technology, it was already developing hypersonic missiles, and Japan was developing them on the basis of Type 12 anti-ship missiles. Japan's increase in its defense budget is an excuse for the so-called "Chinese military threat," and now Japan is once again using the threat of China's hypersonic missiles to collude with the United States.