Considering Zander's strength, it was indeed easy for him to declare war against Tissuria and put all the ministers and the entire Royal Family behind bars. That way, even the Left Minister wouldn't be able to do anything. War was something that Zander would not want to happen, except if he had no other choice.
Somehow, Vaughn understood Zander's reasons for taking a long route to resolving the crisis of both kingdoms. He also became aware that they would not be able to match the military strength of Ishelon. The whole of Tissuria always believed that they could defeat Ishelon if war broke off. The Left Minister may have thought that the elite soldiers in his private army were way better than the military men of Ishelon – he was wrong.