Since when does country A decide what the purpose of country B's military is?
On smaller scale, this is the (in)famous "fire and motion"[0], which works in business as much as it does in military tactics. Make a move, forcing competitors to respond to it. If you're better at it than them (and lucky), you can choose your moves to make their responses go to your advantage.
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[0] - https://www.joelonsoftware.com/2002/01/06/fire-and-motion/