Axis & Allies Developer and Playtester; War of the Ring Editor and Playtester
I did notice no info in this doc about Naval Blockade of Industrial ports. Immediate combat if ships build in Los Angeles with blockading jap battleship.
That's because it's the same in all of the versions since the 2nd edition of Classic (1986). In your example, nothing would happen immediately, as the US combat phase is over, but on Japan's next turn its battleship must either move away in combat movement or stay and fight.