Japan Greenlights Major Defense Supplement to Accelerate Frigate and Submarine Construction
On November 28, the cabinet of Japanese Prime Minister Sanae Takaichi approved 847.2 billion yen ($5.4 billion) defense spending in the fiscal 2025 supplementary budget amid growing military threats from China, North Korea and Russia.
A key portion of the budget allocates 122.2 billion yen (~$782 million) to “enhancing capabilities by securing the early operational readiness of aircraft and vessels.”
The breakdown of construction costs includes about 11.5 billion yen (~$73.6 million) for two Mogami-class frigates for the Japan Maritime Self-Defense Force, about 2.9 billion yen for two upgraded Mogami-class vessels, called the New FFMs (also known as 06FFM), and about 39.3 billion yen for four Taigei-class submarines.
A spokesperson at the Japanese Defense Ministry’s press office told Naval News on November 28 that these expenditures are “part of efforts to accelerate procurement, representing an advance allocation of future-year payments drawn from construction costs already approved in the existing budget.”
The spokesperson also said that this approach “ensures that companies can secure the necessary funds reliably and at an early stage, enabling them to begin manufacturing work sooner and, as a result, bringing forward the delivery schedule.”
“The supplementary budget draft includes only the construction costs and does not cover related expenses such as those for the Vertical Launching System (VLS),” the spokesperson added.
The additional funding is intended to secure the JMSDF’s operational readiness as soon as possible, as Japan moves to strengthen deterrence amid a rapidly deteriorating regional security environment as a maritime nation.
The JMSDF plans to build a total of 12 Mogami-class frigates. From fiscal year 2024 to 2028, Japan will earmark funds to acquire the upgraded Mogami-class vessels. The first of the upgraded class of frigates is scheduled to be commissioned in fiscal year 2028, and if construction proceeds smoothly, all 12 New FFMs will be in service within by fiscal year 2032.
A JMSDF spokesperson has told Naval News that Tokyo has not officially decided on how many submarines of the Taigei-class will be built. But it is likely that the total will be about 12. In Japan’s previous submarine production runs, 11 Oyashio-class ships and 12 Soryu-class ships were built.


