"Russian jet collides with US drone over Black Sea"

[voyageur9]

LW50

"Act of war means hostile or warlike action, whether declared or not, in a time of peace or war, whether initiated by a local government, foreign government or foreign group, civil unrest, insurrection, rebellion or civil war."

So, this seems to fit the the "hostile or warlike action .... in a time of peace or war" but, in fairness, I couldn't find an equivalent in the various Geneva conventions. So, perhaps my use of a law dictionary definition was too quick on the trigger. My apologies.

In U.S. law .... 18 USC § 2331(4) .... an act of war is defined as follows:
(4) the term “act of war” means any act occurring in the course of— (A) declared war; (B) armed conflict, whether or not war has been declared, between two or more nations; or (C) armed conflict between military forces of any origin;

the interaction over the Black Sea likely falls short of the second definition.
best regards