The occupation of Kunming would prevent the re-establishment, at least temporarily, of communication between China and her Allies. It would make it difficult, if not impossible, for an effective Allied air force to be maintained in China. 9. For either of the above operations, however, the Japanese would need considerably more land and air forces than they can now safely spare. The physical difficulties of the operations would be formidable owing to the nature of the country. Japan would be involved, even after the completion of the operations, in a large additional military and administrative commitment at a time when British and American pressure could be expected to be increasing.