President Zelensky has stated that European allies have failed to provide solid assurances that they will defend Ukraine in the event of a fresh offensive by Russia.
"I continue to pose this critical question to all our partners and thus far, the answer remains elusive a clear, unambiguous answer yet," he told reporters on Wednesday.
These remarks follow a day after Britain and France signed a statement of purpose 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 US, which has been leading efforts to end the invasion, reportedly did not sign such a commitment at discussions held in the French capital on Tuesday.
After the Paris talks, which included some 30 countries that form the group termed the 'Coalition of the Willing', UK Prime Minister Sir Keir Starmer said the two nations would "establish military hubs across Ukraine" to deter future invasion, while France's President Macron subsequently indicated thousands of troops may be sent.
Allies proposed that the US would take the lead in overseeing any ceasefire. But the central sticking point of ceding land that Ukraine is being pressured to offer to Russia as part of the peace proposals are still being discussed.
Moscow has not yet commented on the announcement made in the French capital.
President Putin launched a comprehensive military assault of Ukraine in February 2022, and Russian forces currently controls about 20% of Ukrainian territory.
The UK Prime Minister characterized the bilateral declaration as "a vital part of our dedication to support Ukraine for the foreseeable future".
He added: "It establishes the pathway for the juridical structure under which allied military personnel could operate on Ukrainian soil, securing Ukraine's skies and seas, and regenerating Ukraine's armed forces for the years to come."
The Ukrainian leader praised that accord as a "significant leap of progress".
Twenty-four hours afterward, however, he appeared less optimistic.
"I see the will, the political resolve, and that the partners are ready, and the allies are willing to give us robust economic measures, powerful defense assurances," he said when questioned if European countries would come to Ukraine's aid.
"However, until we don't have such binding security pacts - formally ratified, supported by parliaments, supported by the United States Congress - this question cannot be answered. And even if they do, you still have to rely primarily on your inherent capabilities."
Negotiations in Paris were also notable owing to the presence of envoys from former President Trump's administration, Steve Witkoff and Jared Kushner.
Witkoff said the participating countries "mostly completed" their work on finalizing security arrangements.
Last week, the President indicated a settlement was "90% ready".
Territorial concessions and security guarantees have been at the forefront of unresolved issues for negotiators.
Putin has repeatedly warned that Ukraine's military must pull back from all of Ukraine's eastern Donbas or Russia will seize it, rejecting any compromise over how to conclude hostilities.
The Ukrainian President has thus far rejected relinquishing any land, but has proposed that Ukraine could withdraw its troops to an agreed point - but provided that Russia did the same.
Russian forces now holds about three-quarters of the Donetsk region, and some 99% of the adjacent Luhansk region. The two regions constitute the industrial Donbas region.
Attacks have been escalating against Ukrainian cities - with a focus on power facilities. Moscow is also achieving incremental advances in seizing additional Ukrainian land.
Ukraine has hit back at objectives inside Russia with unmanned aerial vehicles, though with varying degrees of effectiveness.
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