Sending a UK AA gun to China is a good move if Jap strikes first (J1 or J2 attack), but I wouldn’t do it if Jap didn’t start war. If Japan doesn’t provoke war sending a UK AA gun to China (rd #2) will require a Dec of War by the UK on Japan, allowing Japan to fight only UK/Anz w/o bringing the US in (also won’t trigger US $40 bonus early). As UK or Anz you really don’t want to make the first move if Japan hasn’t attacked yet. Sit back and collect the extra income (NO’s/Dutch) and build your forces. I would move the UK AA gun up to Burma UK1, then if Japan strikes first (attacks UK, Anz, Dutch or US) try to get it to China.