So we have finally received first contact from an alien civilization, a spaceship hovering in orbit around our world has broadcast a signal saying they "come in peace". Not only that, they seem to come bearing gifts of knowledge and advanced tech, offering to "teach us what we need to know to evolve". How would today's world leaders respond? Would they trust the messages and take a chance? Would the aliens be met with paranoia and mistrust? Would we simply ignore it altogether? A "see no evil hear no evil" attitude? Remember, all we know of them is the vague messages and promises broadcast to us, and that they have interstellar ships and are extremely advanced. assuming this happened soon, in today's time and world, (anytime from tomorrow to about a year from now).
World leaders are not all of a mind. They will have different reactions. I can suppose two common types of reaction, though:
Their existence contradicts religion, so denial or recasting in terms of the religion’s bad guys.
“How can I benefit from this to gain more power and influence?”
No world leader is rational in the sense of a scientist; they commonly see the world in terms of what they can convince people to accept without having any concept of objective truth.