President Zelensky has stated that Ukraine's partners in Europe have not given him sound guarantees that they will protect his country in the case 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 stated to the press on Wednesday.
These remarks follow a day after the UK and France signed a statement of purpose on stationing forces in Ukraine if a peace deal to conclude the conflict with Moscow is finalized.
However, full security guarantees have yet to be solidified. The United States, which has been leading efforts to end the invasion, reportedly did not sign such a pledge at discussions held in the French capital 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 two nations would "establish military hubs across Ukraine" to prevent any future incursion, while France's President Macron subsequently indicated thousands of troops may be sent.
Partner nations suggested that the United States would assume a leading role in monitoring a truce. But the key issue of ceding land that Ukraine is being pressured to offer to Russia as part of the peace proposals are still being discussed.
The Russian government has thus far remained silent on the declaration made in the city of Paris.
Russian President Vladimir Putin launched a comprehensive military assault of Ukraine in February 2022, and Moscow now occupies about 20% of Ukraine's land.
Sir Keir described the joint statement as "a vital part of our dedication 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."
Zelensky hailed that accord as a "huge step forward".
Twenty-four hours afterward, however, he appeared less optimistic.
"I perceive the determination, the political will, 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 European countries would defend Ukraine.
"But as long as we don't have such binding security pacts - formally ratified, supported by parliaments, backed by the U.S. Congress - this question cannot be answered. And should they materialize, you still have to rely first and foremost 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.
One envoy stated the participating countries "mostly completed" their work on finalizing security arrangements.
Last week, Zelensky said a peace deal was "90% ready".
Questions of land and defense pledges have been at the forefront of outstanding matters for diplomats.
Putin has repeatedly warned that Ukrainian troops must pull back from the entirety of the Donbas region or Russia will seize it, rejecting any compromise over how to end the war.
The Ukrainian President has thus far rejected relinquishing any land, but has proposed that Ukraine could withdraw its troops to an established line - but provided that Russia reciprocated the action.
Russian forces now holds about 75% of the Donetsk region, and some nearly all of the adjacent Luhansk region. The pair of oblasts constitute the Donbas industrial heartland.
It has been intensifying attacks against cities in Ukraine - with a focus on power facilities. Russia has also made incremental advances in capturing more Ukrainian territory.
Ukrainian forces have retaliated at Russian targets with drones, albeit with more limited success.
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