It sounds like you many think GPS is property of the global community, and access to it - which the U.S. freely grants worldwide for the public good - is some kind of right. It is not. GPS was financed, developed, and deployed by the United States government, originally for military purposes. It is operated and maintained by the United States Air Force. American taxpayers foot the bill for this maintenance.

If we return to your example, we find India prosecuting a war with the use of American military technology. How exactly is it "bullying" for the U.S. to deny India access to this advanced capability? India is free to fund, launch, and maintain their own GPS alternative for Indian military purposes.