Do we know if Japan has any plans for more aegis destroyers?
Japan's navy is quite impressive given they have 8 055 near-equivalents in the Maya, Atago and Kongo classes and 6 052D near-equivalents in the Akizuki and Takanami classes and up to 39 054A near-equivalents (9 Murasame, 8 Asagiri, 22 planned Mogami). I was actually under the impression it was fairly demilitarised.
According to Japan’s Sankei Shimbun, the Land Self-Defense Force’s “Amphibious Regiment”, known as the Japanese version of the “Marine Corps,” as part of the comprehensive exercise of the Land, Sea and Air Self-Defense Forces, was in Tanegashima, Kagoshima Prefecture on the 25th. The content of amphibious combat training was disclosed to the media. The main task of the "Amphibious Mobile Corps" is to "defend the Southwestern Islands." The training the reporter observed that day was based on the hypothetical scenario of "retaking the occupied outlying islands".
PHILIPPINE SEA (Jan. 22, 2022) Japan Maritime Self-Defense Force (JMSDF) Hyuga-class helicopter destroyer JS Hyuga (DDH 181) and U.S. Navy Arleigh Burke-class guided-missile destroyer USS Gridley (DDG 101) transit the Philippine Sea. (U.S. Navy photos by Mass Communication Specialist Seaman Apprentice Derek Kelley)
PHILIPPINE SEA (Jan. 22, 2022) Japanese Maritime Self-Defense Force (JMSDF) Hyūga-class helicopter destroyer JS Hyūga (DDH 181) participates in training as aircraft from U.S. Navy Nimitz-class aircraft carriers USS Carl Vinson (CVN 70) and USS Abraham Lincoln (CVN 72) perform a fly over. (U.S. Navy photo by Intelligence Specialist 1st Class Jeremy Faller)
PHILIPPINE SEA (Jan. 22, 2022) From left to right, U.S. Navy Wasp-class landing helicopter dock USS Essex (LHD 2), Arleigh Burke-class guided-missile destroyer USS Gridley (DDG 101), Japan Maritime Self-Defense Force Hyuga-class helicopter destroyer JS Hyuga (DDH 181), transit the Philippine Sea. (U.S. Navy photos by Mass Communication Specialist Seaman Leon Vonguyen)