President Zelensky has stated that European allies have failed to provide concrete pledges that they will protect his country in the event of a fresh offensive by Russia.
"I continue to pose this critical question to every one of our allies and I have not received a definitive and straightforward response yet," he told reporters on Wednesday.
His comments come a day after the UK and France inked a declaration of intent on deploying troops in Ukraine if a peace deal to end the war with Russia is finalized.
However, comprehensive defense assurances have yet to be solidified. The United States, which has been spearheading initiatives to halt the offensive, reportedly did not sign such a pledge at talks in Paris on the previous day.
After the Paris talks, which involved some three dozen nations that comprise the so-called Coalition of the Willing, UK Prime Minister Sir Keir Starmer said the two nations would "set up operational bases across Ukraine" to deter future invasion, while France's President Macron later said a significant number of soldiers may be sent.
Allies proposed that the United States would assume a leading role in overseeing any ceasefire. But the key issue of territorial concessions that Ukraine is being pressured to offer to Russia as part of the peace proposals are still being discussed.
The Russian government has not yet commented on the declaration made in the city of Paris.
Russian President Vladimir Putin initiated a comprehensive military assault of Ukraine in February 2022, and Moscow now occupies about one-fifth of Ukrainian territory.
Sir Keir described the joint statement as "a vital part of our dedication to support Ukraine for the long-term".
He continued: "It paves the way for the legal framework under which British, French and partner forces could operate on Ukrainian soil, securing Ukraine's skies and seas, and rebuilding Ukraine's military for the years to come."
Zelensky hailed that accord as a "huge step forward".
Twenty-four hours afterward, however, he appeared less optimistic.
"I see the will, the political resolve, and that the allies are prepared, and the partners are ready to give us strong sanctions, powerful defense assurances," he said when asked if nations in Europe would defend Ukraine.
"But as long as we don't have such security guarantees - legally binding, endorsed by legislatures, backed by the U.S. Congress - this question remains unresolved. And even if they do, you still have to rely primarily on your own strength."
Negotiations in Paris were also significant owing to the presence of envoys from former President Trump's administration, Jared Kushner and Steve Witkoff.
Witkoff said the participating countries "mostly completed" their work on finalizing security arrangements.
Recently, Zelensky said a peace deal was "90% ready".
Territorial concessions and defense pledges have been at the center of outstanding matters for diplomats.
The Russian leader has consistently stated that Ukrainian troops must withdraw from the entirety of the Donbas region or Moscow will take control, rejecting any compromise over how to conclude hostilities.
The Ukrainian President has thus far rejected relinquishing any land, but has suggested that Ukraine could withdraw its troops to an agreed point - but provided that Russia did the same.
Moscow currently controls about 75% of the Donetsk region, and some 99% of the neighbouring Luhansk. The two regions constitute the Donbas industrial heartland.
Attacks have been escalating against Ukrainian cities - with a focus on power facilities. Russia has also made incremental advances in seizing additional Ukrainian land.
Ukraine has hit back at Russian targets with drones, albeit with varying degrees of effectiveness.
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