Couple questions:
First, a repost since I got a couple differet answers. Can Japan build an IC on mainland China, on Kiansu for example, and if so minor or major. Same basic question for other countries, can other build IC’s on land that is not theirs? USA on Russia for example. The rules seem to read no.
Second, SZ 6 has USA fleet in it surrounding Japan. A) Can I take planes off Japan, pass through SZ 6 to another to sink undefended transports, or do they enter battle in SZ 6. B) Can I bring planes from the mainland back to Japan, through SZ 6 on Non Combat Movement without a battle?