World leader means the/a main head leader of a sovereign country recognised by the UN. E.g a president or prime minister NOT just a parliament member. For countries with more then one president such as Bosnia and Herzegovina it can be any of their 3 presidents.
The world leader must be proved to have been killed (assassinated) and not just have died by mysterious or questionable circumstances.
The end time for this to occur is the 31st of December 2024 at 23:59.
Even if Trump ain't in power yet I'd say this event tips things in favour: https://www.tampabay.com/news/florida-politics/2024/07/13/assassination-attempt-florida-reacts-incident-donald-trump-rally/
Zelenskyy being possibly-killed this year is trading at 0.11
https://manifold.markets/Santiago/will-volodymir-zelensky-be-killed-i?r=WFRYaW52ZXJzZVhUWQ