Leaders of France, Germany, the UK and Poland - part of the so-called "coalition of the willing" - were hosted by Ukraine's President Volodymyr Zelensky and took part in a joint news conference during the trip.
They warned that "new and massive" sanctions would be imposed on Russia's energy and banking sectors should Putin not agree to the unconditional 30-day ceasefire "in the air, at sea and on land".
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