This includes investment in the development of stealth fighter jets, new long-range missile systems and new compact warships, with the goal to counter potential threats from China and North Korea.Diplomacy, economic aid and development, and a close relationship with the United States under the terms of the 1960 security treaty are all considered more important.[2] In addition to annual budgets, the Defense Agency prepared a series of cabinet-approved buildup plans beginning in 1957, which set goals for specific task capabilities and established procurement targets to achieve them.For the GSDF, these measures included the purchase of advanced weapons and equipment to improve antitank, artillery, ground-to-sea firepower, and mobile capabilities.Although some ¥34.6 billion was authorized over several years for joint Japan-United States research and development of the experimental FSX fighter aircraft, disputes over this project were believed to have convinced the Defence Agency to strengthen the capability of the domestic arms industry and increase its share of SDF contracts.After originally being cut, funds were also restored for thirty advanced model tanks and the last Aegis multiple-targeting-equipped destroyer escort needed to complete the Mid-Term Defence Estimate.