President Zelensky has stated that Ukraine's partners in Europe have failed to provide sound guarantees that they will defend Ukraine in the case of a fresh offensive by Russia.
"I continue to pose this critical question to every one of our allies and thus far, the answer remains elusive a definitive and straightforward response yet," he told reporters on Wednesday.
His comments come a day after the UK and France signed a declaration of intent on deploying troops in Ukraine if a peace deal to end the war with Russia is agreed.
However, full security guarantees have yet to be solidified. The United States, which has been leading efforts to end the invasion, was reported to have abstained from signing such a pledge at talks in Paris on Tuesday.
Following the negotiations in Paris, which included some three dozen nations 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 prevent any future incursion, while France's President Macron subsequently indicated thousands of troops may be sent.
Partner nations suggested that the US would take the lead in overseeing any ceasefire. But the central sticking point of ceding land that Ukraine is being asked to grant to Russia as a component of the settlement terms are continuing to be negotiated.
Moscow has thus far remained silent on the declaration made in the city of Paris.
President Putin launched a comprehensive military assault of Ukraine in February 2022, and Russian forces currently controls about one-fifth of Ukrainian territory.
The UK Prime Minister characterized the joint statement as "a vital part of our commitment to stand with Ukraine for the foreseeable future".
He added: "It establishes the pathway for the juridical structure under which allied military personnel could operate on Ukraine's territory, securing Ukraine's skies and seas, and rebuilding Ukraine's military for the years to come."
Zelensky hailed that agreement as a "significant leap of progress".
Twenty-four hours afterward, however, he seemed more cautious.
"I see the will, the political will, and that the partners are ready, and the partners are ready to give us robust economic measures, strong security guarantees," he said when questioned if European countries would come to Ukraine's aid.
"But as long as we lack such security guarantees - formally ratified, supported by parliaments, supported by the United States Congress - this crucial issue remains unresolved. And should they materialize, you must ultimately depend primarily on your inherent capabilities."
Negotiations in Paris were also notable due to the attendance of envoys from former President Trump's administration, Jared Kushner and Steve Witkoff.
One envoy stated the allies "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 center of unresolved issues for negotiators.
The Russian leader has consistently stated that Ukraine's military must withdraw from all of Ukraine's eastern Donbas or Russia will seize it, dismissing potential concessions over how to conclude hostilities.
Zelensky has so far ruled out ceding any territory, but has proposed that Ukraine could redeploy its forces to an agreed point - but provided that Russia reciprocated the action.
Moscow currently controls about three-quarters 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 cities in Ukraine - particularly targeting power facilities. Moscow is also achieving slow progress 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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