Who is the leader of the trisolaran?

Could you elaborate on who the leader of the Trisolarans is? Are they a collective or do they have a single, definitive leader? If there is a specific individual or entity at the helm, what are their qualifications and how did they come to power? Is there a democratic process involved, or is it more of a monarchy or authoritarian regime? Additionally, how does their leadership style impact the Trisolaran society and their interactions with other civilizations, including Earth?