ZacharYaakov

I have 15 cities, several times I’ve been attacked by nations with 1000+ score than me and are far out of my war range. These nations have deliberately dropped their military strength to be within war range of smaller nations and then once declaring war they have recruited troops to surpass their numbers. I’m curious, is this meant to be a feature? It seems like a clear exploit if a nation with 20 cities can drop to fight a nation with 15.