Would exercising with Force Z violate American neutrality?

Would a joint exercise with the Royal Navy's Force Z violate US neutrality?

It would push neutrality, but could plausibly be justified as routine cooperation and a diplomatic demonstration rather than belligerent action.

The United States was already stretching neutrality through Atlantic patrols and support for British warships. A passing exercise with Force Z could be framed as professional exchange between navies that were already sharing experience. Linking the display to support for French control of Indochina would give it a diplomatic purpose short of attacking Japan. The exercise would push neutrality hard, but it remains a plausible extension of existing cooperation rather than an automatic declaration of war.