Lets say I have a submarine placed 1 sea zone away from a coast that has enemy fighters. Can those fighters attack my submarine, if so what defensive actions can my submarine take?
If your’s attacking the capital, you wouldn’t want to SBR, 'cause the IPC’s will be yours after the takeover. If attacking a non-capital IC, go ahead, as it depletes your enemy’s IPC’s.
Both moves are legal, the first just wouldn’t do you any good. :-D