It doesn't? This is a war. Russia tried to decapitate Ukraine's military leadership by trying to kill Zelenksy. Why can Ukraine not try that on Russia's bureaucracy orchestrating the whole war?
Bashar al-Assad has been on a hitlist for strategic reasons by the West for as long as we can remember for example.
But in today's politics, Zelenksy visiting Saudi Arabia and recently entertaining a Chinese diplomat are shocking because these are supposed to be two tenuous allies of Russia.