Back in the day, the Soviet Pacific fleet had a couple of Kievs and a couple of KIrovs, associated escorts, plus all the boats. Point being the JMSDF role was to provide (exclusively) defensive sea control in the seas relatively local to Japan, with the USN doing the heavy lifting offensively elsewhere.Worth noting that the Soviet Pacific fleet was and is a relatively small percentage... Dozen SSNs plus a squadron or so of Destroyers?
Of course not, because their raison d'etre has not changed, just the likely threat country - perhaps I didn't make that clear. It's that nice Mr Xi and his eyes on the Senkaku they're worried about at the minute, rather than the equally nice, (but currently less ambitious in that area) Mr Putin.Their force structure hasn't changed that much that I've seen... Other than announcing a squadron of Daves on their 'definitely not carriers which are definitely quite small' Izumo.