Well Asylon has a defensive alliance with Terran. Terran declared war, but Kabrinskia entered Terran territory thereby activating the treaty. If Terran had of declared war and then invaded Kabrinskia they would be fighting alone right now.
I see Asylon as doing the honorable thing by keeping their word to Tarran, I am sorry we are going to have to fight you guys. We will of course send you home in pieces....