An independent Japanese air force and interservice conflict

How might other powers react if creating an independent Japanese air force caused civil war between the army and navy?

Britain might back the naval side and the United States the army side, turning the conflict into a proxy struggle between major powers.

Creating a separate Japanese air force would not automatically force the United States to copy it because Britain and other states already had independent air forces. A civil war between Japan's army and navy would create a different problem. Institutional alignments could pull Britain toward its traditional Japanese naval partners while the United States favored the army side. The conflict could then become a proxy contest shaped by each power's interest in Japan's ability to project naval force.