I think that a bit of secrecy in the game is a good thing, if anyone sees that their neighbor is at war than the chances are bigger that other countries join the fight and the player gets annihilated. Now you need to read the newspaper or the players profile. The players who do the effort to be up to date are rewarded this way and have an advantage compared to the more lazy players. All the information is there if you know where to find it. Your suggestion would make things too obvious and would be a huge disadvantage for the attacked player.