President Zelensky has stated that European allies have failed to provide concrete pledges that they will protect his country in the event of a future Russian attack.
"I am asking this very question to all our partners and thus far, the answer remains elusive a definitive and straightforward response yet," he told reporters on midweek.
His comments come a day after Britain and France signed a statement of purpose on deploying troops in Ukraine should a ceasefire agreement to conclude the conflict with Moscow is agreed.
However, comprehensive defense assurances have not been agreed. The United States, which has been spearheading initiatives to halt the offensive, was reported to have abstained from signing such a commitment at discussions held in the French capital on the previous day.
Following the negotiations in Paris, which included some 30 countries that form the group termed the 'Coalition of the Willing', British PM Keir Starmer said the UK and France would "establish military hubs across Ukraine" to prevent any future incursion, while France's President Macron subsequently indicated thousands of troops may be sent.
Allies proposed that the US would take the lead in monitoring a truce. But the key issue of ceding land that Ukraine is being asked to grant to Russia as part of the peace proposals are continuing to be negotiated.
The Russian government has not yet commented on the announcement made in the French capital.
President 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 commitment to stand with Ukraine for the long-term".
He added: "It paves the way for the legal framework under which allied military personnel could function on Ukraine's territory, protecting Ukrainian airspace and waters, and regenerating Ukraine's armed forces for the years to come."
Zelensky hailed that accord as a "significant leap of progress".
A day later, however, he seemed more cautious.
"I see the will, the political resolve, and that the partners are ready, and the partners are ready to give us robust economic measures, powerful defense assurances," he said when questioned if nations in Europe would defend Ukraine.
"But as long as we lack such security guarantees - formally ratified, endorsed by legislatures, backed by the U.S. Congress - this question cannot be answered. And even if they do, you still have to rely first and foremost on your own strength."
Negotiations in Paris were also notable owing to the attendance of US President Donald Trump's peace envoys, Steve Witkoff and Jared Kushner.
One envoy stated the participating countries "mostly completed" their work on agreeing security protocols.
Recently, Zelensky said a peace deal was "90% ready".
Territorial concessions and defense pledges have been at the center of outstanding matters for negotiators.
The Russian leader has consistently stated that Ukrainian troops must withdraw from all of Ukraine's eastern Donbas or Russia will seize it, dismissing potential concessions over how to end the war.
Zelensky has so far ruled out ceding any territory, but has proposed that Ukraine could withdraw its troops to an established line - but provided that Russia did the same.
Moscow now holds about three-quarters of the Donetsk oblast, and some nearly all of the neighbouring Luhansk. The pair of oblasts constitute the industrial Donbas region.
It has been intensifying attacks against Ukrainian cities - particularly targeting power facilities. Russia has also made incremental advances in seizing additional Ukrainian land.
Ukrainian forces have retaliated at objectives inside Russia with drones, though with varying degrees of effectiveness.
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