Japanese STRATEGIC MASTERSTROKE!
Any units which SURVIVE COMBAT (i.e., must roll dice OR conquer territory) this turn get to make an EXTRA ATTACK move on the enemy in an adjacent territory or sea zone.
This additional attack phase and the resultant combats are conducted here, by forum.
After this is resolved, go back, edit in the results, and finish non-combat movement and placement as normal.

Example from current game: The Japanese in Chahar attack the Russians in Suiyuyan. Japan wins with 2 infantry left. These troops could then move on to make a second attack on the lone Russian in Tsagaam Olom, if they wish.
I hope this is clear; please let me know if you have any questions.