President Zelensky has stated that European allies have failed to provide sound guarantees that they will defend Ukraine in the event of a future Russian attack.
"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 midweek.
These remarks follow a day after Britain and France inked a declaration of intent on stationing forces in Ukraine should a ceasefire agreement to end the war with Russia is finalized.
However, full security guarantees have not been agreed. The US, which has been spearheading initiatives to end the invasion, reportedly did not sign such a commitment at discussions held in the French capital on Tuesday.
Following the negotiations in Paris, which involved some three dozen nations that comprise the group termed the '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 French President Emmanuel Macron subsequently indicated a significant number of soldiers may be sent.
Partner nations suggested that the US would assume a leading role in overseeing any ceasefire. But the key issue of territorial concessions that Ukraine is being pressured to offer to Russia as a component of the settlement terms are continuing to be negotiated.
The Russian government has not yet commented on the announcement made in the French capital.
Russian President Vladimir Putin initiated a comprehensive military assault of Ukraine in the early months of 2022, and Moscow now occupies about 20% of Ukrainian territory.
Sir Keir described the joint statement as "an essential component of our dedication to stand with Ukraine for the foreseeable future".
He added: "It establishes the pathway for the legal framework under which allied military personnel could operate on Ukrainian soil, securing Ukraine's skies and seas, and regenerating Ukraine's military for the future."
The Ukrainian leader praised that agreement as a "huge step forward".
A day later, however, he appeared less optimistic.
"I see the will, the political resolve, and that the partners are ready, and the allies are willing to give us strong sanctions, powerful defense assurances," he said when questioned if nations in Europe would come to Ukraine's aid.
"However, until 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 primarily on your own strength."
Negotiations in Paris were also notable owing to the attendance of envoys from former President Trump's administration, Jared Kushner and Steve Witkoff.
Witkoff said the participating countries "largely finished" their work on agreeing security protocols.
Recently, Zelensky said a settlement was "90% ready".
Territorial concessions and security guarantees have been at the center of outstanding matters for diplomats.
Putin has repeatedly warned that Ukraine's military must pull back from all of Ukraine's eastern Donbas or Moscow will take control, rejecting any compromise over how to conclude hostilities.
The Ukrainian President has thus far rejected relinquishing any land, but has suggested that Ukraine could withdraw its troops to an established line - but provided that Russia reciprocated the action.
Moscow currently controls about three-quarters of the Donetsk region, and some 99% of the neighbouring Luhansk. The pair of oblasts constitute the Donbas industrial heartland.
Attacks have been escalating against cities in Ukraine - particularly targeting power facilities. Moscow is also achieving incremental advances in capturing more Ukrainian territory.
Ukraine has hit back at objectives inside Russia with unmanned aerial vehicles, though with varying degrees of effectiveness.
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