President Zelensky has stated that Ukraine's partners in Europe have failed to provide solid assurances that they will protect his country in the event of a fresh offensive by Russia.
"I continue to pose this critical question to all our partners and I have not received a clear, unambiguous answer yet," he stated to the press on midweek.
These remarks follow a day after Britain and France signed a declaration of intent on stationing forces in Ukraine if a peace deal to conclude the conflict with Moscow is agreed.
However, comprehensive defense assurances have yet to be solidified. The US, which has been spearheading initiatives to end the invasion, was reported to have abstained from signing such a commitment at talks in Paris on the previous day.
Following the negotiations in Paris, which included some 30 countries that comprise the so-called Coalition of the Willing, UK Prime Minister Sir Keir Starmer said the two nations would "establish military hubs across Ukraine" to prevent any future incursion, while France's President Macron later said thousands of troops may be deployed.
Allies proposed that the United States would assume a leading role in overseeing any ceasefire. But the key issue of ceding land 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 announcement made in the French capital.
President Putin initiated a full-scale invasion of Ukraine in February 2022, and Moscow now occupies about one-fifth of Ukrainian territory.
Sir Keir described the bilateral declaration as "an essential component of our dedication to support Ukraine for the foreseeable future".
He added: "It paves the way for the juridical structure under which British, French and partner forces could operate on Ukrainian soil, securing Ukraine's skies and seas, and rebuilding Ukraine's military for the years to come."
Zelensky hailed that accord as a "significant leap of progress".
A day later, however, he seemed more cautious.
"I perceive the determination, 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 come to Ukraine's aid.
"But as long as we lack such security guarantees - legally binding, endorsed by legislatures, supported by the United States Congress - this question remains unresolved. 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 attendance of US President Donald Trump's peace envoys, Steve Witkoff and Jared Kushner.
Witkoff said the participating countries "largely finished" their work on agreeing security protocols.
Last week, the President indicated a peace deal was "ninety percent complete".
Territorial concessions and defense pledges have been at the center of unresolved issues for diplomats.
Putin has repeatedly warned that Ukraine's military must withdraw from the entirety of the Donbas region or Moscow will take control, dismissing potential concessions over how to end the war.
The Ukrainian President has thus far rejected ceding any territory, but has proposed that Ukraine could redeploy its forces to an agreed point - but provided that Russia did the same.
Moscow now holds about 75% of the Donetsk region, and some 99% of the neighbouring Luhansk. The two regions form the industrial Donbas region.
It has been intensifying attacks against cities in Ukraine - with a focus on power facilities. Moscow is also achieving slow progress in capturing more Ukrainian territory.
Ukraine has hit back at objectives inside Russia with drones, though with varying degrees of effectiveness.
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