Speaking just hours before Sir Keir Starmer met with US President Joe Biden in Washington, the Ukrainian leader urged both to "truly change the course of the war".
He suggested British-made Storm Shadow and American ATACMS missiles would allow his forces to destroy key Russian military targets "in a matter of months".
President Zelensky said: "I believe there should be no unanswered questions about why Ukraine needs sufficient longrange capabilities.
"I want to emphasise the word 'sufficient' - not just enough to say that there is a decision, but enough to truly change the course of the war and compel Russia to seek peace.
"This requires strong decisions from the world. You all know what these decisions are. When we hear that missiles have arrived in Russia from Iran, it is the same evil that the allies had to shoot down in the skies of the Middle East.
"So far, the only country that has managed to shoot down Russian drones is Belarus. This is humiliating for the democratic world. We know where Russian air defence is located, where Russian missile launchers are being deployed, and what logistics routes are critical for the Russian occupation forces.
"All of this can be destroyed in a matter of months. Let me remind you, the full-scale war has been ongoing for three years now. So, what is missing to end it? Strength? Decisions? Or the will?"
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