President Zelensky has stated that European allies have not given him solid assurances that they will protect his country in the event of a future Russian attack.
"I am asking this very question to every one of our allies and I have not received a clear, unambiguous answer yet," he told reporters on Wednesday.
These remarks follow a day after the UK and France inked a declaration of intent on stationing forces in Ukraine should a ceasefire agreement to conclude the conflict with Moscow is finalized.
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.
Following the negotiations in Paris, which included some three dozen nations that form the so-called Coalition of the Willing, British PM Keir Starmer said the UK and France would "establish military hubs across Ukraine" to deter future invasion, while France's President Macron later said thousands of troops may be sent.
Partner nations suggested that the United States would take the lead in monitoring a truce. But the central sticking point of ceding land that Ukraine is being pressured to offer to Russia as part of the peace proposals are continuing to be negotiated.
Moscow has not yet commented on the declaration made in the French capital.
President Putin launched a full-scale invasion of Ukraine in the early months of 2022, and Russian forces currently controls about 20% of Ukrainian territory.
Sir Keir described the joint statement as "a vital part of our dedication to stand with Ukraine for the long-term".
He continued: "It paves the way for the legal framework under which British, French and partner forces could function on Ukrainian soil, protecting Ukrainian airspace and waters, and rebuilding Ukraine's military for the years to come."
The Ukrainian leader praised that accord as a "huge step forward".
A day later, 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 robust economic measures, powerful defense assurances," he said when questioned if nations in Europe would defend Ukraine.
"But as long as we don't have such binding security pacts - formally ratified, endorsed by legislatures, supported by the United States Congress - this crucial issue cannot be answered. And should they materialize, you still have to rely first and foremost on your own strength."
Negotiations in Paris were also notable owing to the presence of US President Donald Trump's peace envoys, Jared Kushner and Steve Witkoff.
One envoy stated the participating countries "mostly completed" their work on finalizing security arrangements.
Recently, the President indicated a peace deal was "ninety percent complete".
Questions of land and security guarantees have been at the forefront of outstanding matters for negotiators.
Putin has repeatedly warned that Ukrainian troops must pull back from the entirety of the Donbas region or Russia will seize it, dismissing potential concessions over how to end the war.
The Ukrainian President has thus far rejected ceding any territory, but has suggested that Ukraine could withdraw its troops to an established line - but provided that Russia reciprocated the action.
Moscow now holds about 75% of the Donetsk oblast, and some 99% of the adjacent Luhansk region. The two regions constitute the Donbas industrial heartland.
It has been intensifying attacks against Ukrainian cities - particularly targeting power facilities. Russia has also made incremental advances in seizing additional Ukrainian land.
Ukraine has hit back at Russian targets with unmanned aerial vehicles, albeit with more limited success.
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