Would outside powers support India in a China crisis?

Would the United States and its allies support India if a China-Pakistan crisis escalated?

Probably, particularly if China were the aggressor, though the scenario carries serious escalation risks.

Outside support would depend on who initiated the war. If Chinese aggression were clear, the United States and allied states would probably support India. The form and scale of that support remain unspecified. The China-Pakistan and nuclear-escalation branches raised in the question also remain unresolved.