President Zelensky has stated that Ukraine's partners in Europe have failed to provide sound guarantees that they will defend Ukraine in the event of a fresh offensive by Russia.
"I am asking this very question to every one of our allies 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 stationing forces in Ukraine if a peace deal to conclude the conflict with Moscow is reached.
However, comprehensive defense assurances have yet to be solidified. The US, which has been spearheading initiatives to halt the offensive, reportedly did not sign such a commitment at talks in Paris on Tuesday.
After the Paris talks, which involved some 30 countries that form the group termed the 'Coalition of the Willing', British PM Keir Starmer said the UK and France would "set up operational bases across Ukraine" to deter future invasion, while France's President Macron later said thousands of troops may be deployed.
Allies proposed that the US would assume a leading role in overseeing any ceasefire. But the central sticking point of territorial concessions that Ukraine is being asked to grant to Russia as a component of the settlement terms are still being discussed.
Moscow has thus far remained silent on the declaration made in the French capital.
Russian President Vladimir Putin launched a full-scale invasion of Ukraine in February 2022, and Russian forces currently controls about one-fifth of Ukrainian territory.
Sir Keir described the joint statement as "a vital part of our commitment to support Ukraine for the long-term".
He added: "It paves the way for the juridical structure under which allied military personnel could function on Ukraine's territory, securing Ukraine's skies and seas, and regenerating Ukraine's armed forces for the future."
The Ukrainian leader praised that accord as a "huge step forward".
Twenty-four hours afterward, however, he appeared less optimistic.
"I perceive the determination, the political resolve, and that the allies are prepared, and the partners are ready to give us robust economic measures, strong security guarantees," he said when asked if nations in Europe would defend Ukraine.
"But as long as we don't have such binding security pacts - formally ratified, endorsed by legislatures, backed by the U.S. Congress - this crucial issue remains unresolved. And even if they do, you must ultimately depend primarily on your inherent capabilities."
The Paris talks were also significant owing to the attendance of US President Donald Trump's peace envoys, Steve Witkoff and Jared Kushner.
One envoy stated the allies "mostly completed" their work on agreeing security protocols.
Recently, the President indicated a settlement was "ninety percent complete".
Territorial concessions and defense pledges have been at the forefront of unresolved issues for diplomats.
Putin has repeatedly warned that Ukrainian troops must withdraw from the entirety of the Donbas region or Russia will seize it, rejecting any compromise over how to end the war.
Zelensky has so far ruled out ceding any territory, but has suggested that Ukraine could redeploy its forces to an established line - but provided that Russia reciprocated the action.
Moscow currently controls about 75% of the Donetsk oblast, and some nearly all of the neighbouring Luhansk. The pair of oblasts form the Donbas industrial heartland.
Attacks have been escalating against Ukrainian cities - particularly targeting power facilities. Moscow is also achieving slow progress in capturing more Ukrainian territory.
Ukrainian forces have retaliated at objectives inside Russia with drones, albeit with more limited success.
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