I am afraid that the JMSDF will turn into the fish food in just few hours.
You simply cannot compare a naval outcome that happened in more than 100 years ago to today's navy standard.
Russian Pacific Fleet would be annihilated in a conventional engagement. Their light cruiser would be dispatched by the 15 destroyers of the 4th Fleet. Their 4 destroyers would be neutralized. Our 15 destroyers that make up the 4th Fleet have powerful ASW capability and would annihilate their subs.
This is not considering the JASDF , which would coordinate with the JMSDF Marine Aviation that would simple dispatch remaining Russian subs.
There is no naval force that can challenge the JMSDF in North East Asia, except the United States Navy.