"war" is very ill-defined
afaik, the only _formal_ declaration of war, since ww2, was Chad vs Sudan some years ago. and if im not totally mistaken, morocco declared war on spain in the 90s, over some islet, but it was instantly annulled.
like peter said
its probably not "WAR" "per se", but rather... any handy synonym you can think of
armed conflict, military intervention, etc