President Zelensky has stated that European allies have not given him concrete pledges that they will protect his country in the event of a future Russian attack.
"I continue to pose this critical question to every one of our allies and I have not received a clear, unambiguous answer yet," he stated to the press on Wednesday.
His comments come a day after the UK and France signed a statement of purpose on deploying troops 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 end the invasion, reportedly did not sign such a pledge at discussions held in the French capital on the previous day.
After the Paris talks, which included some 30 countries 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 French President Emmanuel Macron later said a significant number of soldiers may be deployed.
Partner nations suggested that the United States would take the lead in overseeing any ceasefire. But the central sticking point of ceding land that Ukraine is being pressured to offer to Russia as a component of the settlement terms are still being discussed.
The Russian government has not yet commented on the declaration made in the French capital.
Russian President Vladimir Putin launched a full-scale invasion of Ukraine in February 2022, and Russian forces now occupies about 20% of Ukrainian territory.
Sir Keir described the bilateral declaration as "a vital part of our dedication to stand with Ukraine for the long-term".
He added: "It paves the way for the juridical structure under which allied military personnel could function on Ukrainian soil, protecting Ukrainian airspace and waters, and regenerating Ukraine's armed forces for the years to come."
Zelensky hailed that agreement 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, strong security guarantees," he said when asked if European countries would defend Ukraine.
"However, until we don't have such security guarantees - legally binding, endorsed by legislatures, backed by the U.S. Congress - this question cannot be answered. And should they materialize, you must ultimately depend first and foremost on your inherent capabilities."
The Paris talks were also significant due 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 agreeing security protocols.
Last week, Zelensky said a settlement was "ninety percent complete".
Territorial concessions and defense pledges have been at the forefront of unresolved issues for negotiators.
The Russian leader has consistently stated 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 relinquishing any land, but has suggested that Ukraine could redeploy its forces to an established line - but only if Russia reciprocated the action.
Russian forces currently controls about 75% of the Donetsk region, and some nearly all of the adjacent Luhansk region. The two regions form the Donbas industrial heartland.
It has been intensifying attacks against Ukrainian cities - particularly targeting power facilities. Moscow is also achieving incremental advances in seizing additional Ukrainian land.
Ukraine has hit back at objectives inside Russia with drones, though with varying degrees of effectiveness.
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