We launch an invasion of Singapore by using our navy to move along the coast of Asia in hopes of avoiding the pirates in the deep ocean areas. Once we arrive, we will deploy marines onto the coast with some regular divisions to move to encircle the city center. At which point we will set up a defensive line on the west to make sure no other Singaporean soldiers can break our siege of the city center. Hopefully after a while they will meet us to discuss a peace deal. for now we will maintain our siege to deny any form of aid to the city. This state is essential to the defense of our oil shipments from the Middle East after all. The air force will play a minimal role in this campaign, opting to take a backseat. Only doing occasional missions by launching off of a Japanese AC
Credit to @abhin2020 for the war map