surveillance craftandB - 52 bombersover the air defense zone in defiance of China’s wishes." We, the United States, are deeply concerned by the attempt to unilaterally change the status quo in the East China Sea, "Vice President Joe Bidensaidback in December during a news conference held there alongside Japanese Prime Minister Shinzo Abe. Now speaking in Washington, DC two months later, Kerry this week hammered home the notion that the US won’t abandon Japan should an attack from China emerge." I… underscored that the United States remains as committed as ever to upholding our treaty obligations with our Japanese allies, ”Reuters quoted Kerry as saying, referencing the Treaty of Mutual Cooperation and Security between both nations signed in 1960." The United States neither recognizes nor accepts China ' s declared East China Sea[Air Defense Identification Zone] and the United States has no intention of changing how we conduct operations in the region, "he added, according to the Associated Press." We are deeply committed to maintaining the prosperity and the stability in the Asia - Pacific. And that won ' t be possible without respect for international law, including freedom of navigation and overflight. ”The US has numerous military bases in Japan and across the region, and would be obligated to provide military assistance under the mutual cooperation treaty should China launch a strike in an attempt to strengthen their hold on the disputed territory. China had the second largest defense budget of all nations in the world as of last year, according to a report by HIS Jane’s Aerospace, Defense and Security, but is leaps and bounds behind what the Pentagon spends annually. Japan currently has roughly the fifth - largest budget of its kind, but made headlines back in December when it was revealed that they are in the midst of boosting defense spending by a significant amount for the first time in nearly 20 years. Any assistance from the US Department of Defense would largely outmatch even the might of the second biggest military in the world.“China is firmly opposed to Japan’s relevant actions, ”state - owned news agency Xinhua quoted the Chinese minister of defense after news of increased spending came out of Tokyo last December. Kerry is expected to make his way to China next week. If history is any indication, however, he’s likely to be met with strong opposition from opponents who wants the US out of the dispute. Vice President Biden made a visit there himself in the midst of his Asian - tour in late 2013, and a planned trip to China prompted the country’s Global Times newspaper to warn against even introducing the topic while meeting with dignitaries." The only choice he has if he wants a successful trip[to China] is not to go too far in his words over there, "an op - ed published at the time read." If he openly supports Tokyo and wants to ' send an expedition to punish ' Beijing, the Chinese people won ' t accept it. "Following Friday’s meeting, Kishida said he and Kerry agreed they will respond to any action from China in the future“calmly and with resolve.” In the meantime, though, both the US and Japan are interested in other endeavors — like the Trans - Pacific Partnership, or TPP. According to the AP, the multi - nation trade deal between the US, Japan and 10 other Pacific - region countries was also among the issues discussed by Kishida and Kerry during Friday’s meeting.“[F] inalizing the TPP is one of the most important things that we can do for our countries’ economic futures, ”Kerry said, according to the AP, and Kishida reportedly added that has tentatively agreed to cooperate towards a“prompt conclusion” of the negotiations.