on http://en.wikipedia.org/wiki/Heinkel_111 - i have seen that there was an agreement with Germany by Japan for receive 44 Heinkel 111 F , obviously this agreement was cancelled . Surely if Japan receveid the Heinkel 111 F ,could been use by IJAAF .
Don't think, that any of the He 111 variants would have satisfied the need for
range by the Japanese services. Carrying a bigger fuel load probably would have
brought the bombload down to that of the Mitsubishi G3M. AFAIK the first version
with some armour protection was the P, so the F version probably still carried no
armour. The He 111 was designed for the European theatre, but the demands for
the SEA theatre were different.