Zelenskyy has also said Kyiv is ready to sign the minerals deal with the U.S., which would create a joint fund from the sale of Ukrainian minerals. Washington says it is crucial to secure continued U.S. backing.
With U.S. support in question, Zelenskyy has been urging his European allies to ramp up their support as Kyiv's battlefield position deteriorates and it faces mounting pressure to retreat from Russia's Kursk region.
Ukrainian troops that stormed into the Kursk region last summer are nearly surrounded by Russian forces, open source maps show.
Russia holds around a fifth of Ukraine's territory, including Crimea which it annexed in 2014, and its troops are also pressing in the eastern Donetsk region, having ramped up drone and missile strikes on cities and towns far from the front.