lol, Gera, wtf is the deal with semantics
the world leader?
sounds like starwars or something..
but if you insist on another totally meaningful argument:
the President is the country leader, same way as the CEO is a company leader.

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Человек, который почувствовал ветер перемен, должен построить не щит от ветра, а ветряную мельницу