They circled Japan with a fast attack submarine following their ass the entire time ready to send them all to Davey Jones locker.
one assumes that was expected and studied as far as sonar returns, if any.
I don’t think japan actually wants a problem with russia, but they are closely tied to the US in terms of the security arrangements vs. china, so they get dragged in. but they made a point of refusing to close down some energy project in russia and saying they had their own needs and would continue the project.