Thanks for the quick reply.  That was one of the first things i tried with my warfleet was to try and invade their planet, as well as knocking out their few assets such as ships and their one mining gem in space.  No matter which ones i attack a message keeps popping up saying that i have to break the alliance first.  Can find no mechinism in the game for breaking alliances with minor races like the Yor.  I figured if the game provided something to click under the details section for making alliances there should be something for breaking them also.  But can find no options for it and it doesn't allow me to attack, planet ships or any other of the Yor assets till i break alliance i've made with them.  I've tried to irratate them in the demands to them over and over and threatened them with large fleet and troop carriers alongside their only planet and mining gem.  Any solution or a place in the game where i can deselect my alliance with them?  Any thoughts, thanks!

Well, I don´t know what version of DL you play, (or to what race you refer as the Yor are not a minor - the "Dark Yor" are...) but in 1.53 you can break an alliance by toggling the "break alliance" button which you will find in the first "foreign relations" screen. It´s to the left under N-1´s face. If you are not into an alliance this button then is the "trade embargo" button.

Hope this did help.