The Admiralty's logic for the Anglo-Japanese Alliance

How influential was the Admiralty in forming the Anglo-Japanese Alliance?

It was highly influential, seeing commercial, industrial, and strategic advantages against Russia and France.

The Admiralty was a leading advocate of the Anglo-Japanese Alliance rather than a passive follower of the Foreign Office. Japan's purchases of British naval equipment created a commercial and industrial connection. The alliance also forced Russia to consider a Pacific opponent and promised reciprocal support if either partner faced a combination involving France and Russia. British planners imagined Japan becoming a second industrial hub and a durable island-monarchy partner in maintaining imperial security, though events did not fulfill that hope.