Select Start game at the title screen. When the blue screen with the Russia mission appears press right to move to the japan mission. Before the information appears on the screen press and hold X and diagonally DownLeft. To choose one just let go of the buttons at the point on the globe that you want to play. Just look at the countries as they pass on the globe and with the correct timing you will be able to let go and start the game on the mission of your choice. After choosing you will see your objectives then begin your mission.