On Substack, Francis Turner discusses what serious countries do (so you know the topic isn’t anything to do with Canada), and part of the post is about the Japanese Navy Japan Maritime Self-Defense Force and its latest ship building program:
Last month Japan started work on its second ASEV (Aegis System Equipped Vessel), which should probably classed a Guided Missile Cruiser, though it is unclear if the C designation will be used (let’s face it Japan still calls its two “not really aircraft carriers, honest guv” aircraft carrying warships “Helicopter Destroyers”. Though apparently it plans to change that soon).
At 190m long and 25m broad, the ASEVs will be some of the largest non-aircraft carrier ships being built by anyone this century1 until the Trump battleships start construction. The Trump battleships are projected to be about 50% larger but they haven’t yet been funded let alone contracted. The USN’s Zumwalts are roughly the same size.
It isn’t just the size that is impressive, it is also the speed of construction. The ASEV as a concept showed up in ~2020 when Japan decided the land based Aegis Ashore program was a failure and cancelled it. In October 2024, after about four years, plans had been made, budget allocated and contracts awarded for the two ships. Construction of the first started last July (2025) and the second last month (February 2026). Construction time is estimated to be around three years, with the first delivered/commissioned in March 2028 and the second one year later. Why one year later and not six months earlier? My guess is that the reason is to incorporate lessons learned from sea trials and operating the first in the final construction stages of the second. This seems similar to the Izumo/Kaga construction a decade ago.
Put together and you have ships that will have gone from concept to contract award in 4 years and contract award to fully-functioning delivery in under 5 years — assuming there are no delays. That seems plausible, the Izumo and Kaga were built in about the same time frame, and stands in stark contrast to the procurement speed of the US Navy and any European navy. The first Zumwalt, for example took over 5 years to go from concept to start of construction and another 5+ from there to commissioning and then another 4 to full acceptance. The ASEVs are also expected to be a lot cheaper, costing around JPY400B or about US$2.5 billion for the initial version. There will undoubtedly be upgrades — e.g. drone defenses, laser or rail guns — and there are some new features compared to previous ships — the SPY7 radar from Lockheed Martin for example — but this is an evolution of existing Japanese and US Aegis destroyers rather than a brand new concept which helps explain why I am confident about the timeline and budget.
Although the ASEV’s primary role is missile defense, there is no reason why one might not, in the fullness of time, be loaded with offensive missiles such as the TLAM or antiship missiles. Indeed the Naval News article lists both as options:
Each vessel will feature a 128-cell Vertical Launch System (VLS) — significantly more than the 96 cells installed on Japan’s latest Aegis destroyers.
The VLS will be capable of launching:
– SM-3 Block IIA interceptors, jointly developed by Japan and the United States for ballistic missile defense
– SM-6 missiles, capable of engaging advanced aerial threats, including hypersonic glide vehicles
The ships will also support Japan’s emerging counterstrike capability.
Planned armament includes:
– the extended-range Type 12 anti-ship missile (ship-launched improved variant)
– the U.S.-made Tomahawk cruise missile
Is that TLAM in your launcher or are you pleased to see me?
Notably the Tomahawk capability has already been fitted to one of the Aegis destroyers this class is supposed to replace. A 128 cell ASEV firing TLAMs could be very unpleasant for Little Rocket Man; if it fired antiship missiles that could make a Chicom invasion of Taiwan pretty miserable just on its own. It would also make a phenomenal commerce raider / blockade enforcer if such roles were needed.
[Aside: Unlike some country’s missiles I’d be pretty confident that the Type 12 anti-ship missile will work well]
As CDR Salamander observed on X, the real question is why Japan doesn’t make a few more and sell them to countries/navies that struggle with procurement. And for that matter why it doesn’t make a couple more for itself. Perhaps it will. I figure there’s a couple of years before there will be yard space to build them so there’s no hurry to make that decision.
Russia’s Kirov class battlecruisers are larger but a) they were built in the 1970s/80s and b) only one is currently active (for some definition of active).
Japan’s decision to rebuild naval strength has been noted by others, too:
