President Zelensky has stated that European allies have failed to provide concrete pledges that they will protect his country in the case of a fresh offensive by Russia.
"I am asking this very question to all our partners and thus far, the answer remains elusive a definitive and straightforward response yet," he told reporters on midweek.
These remarks follow a day after the UK and France inked a declaration of intent on deploying troops in Ukraine should a ceasefire agreement to end the war with Russia is reached.
However, full security guarantees have not been agreed. The US, which has been leading efforts to end the invasion, reportedly did not sign such a pledge at talks in Paris on the previous day.
Following the negotiations in Paris, which included some three dozen nations that comprise the so-called Coalition of the Willing, UK Prime Minister Sir Keir Starmer said the two nations would "set up operational bases across Ukraine" to prevent any future incursion, while French President Emmanuel Macron subsequently indicated thousands of troops may be deployed.
Allies proposed that the United States would assume a leading role in monitoring a truce. But the central sticking point of territorial concessions that Ukraine is being pressured to offer to Russia as part of the peace proposals are continuing to be negotiated.
The Russian government has not yet commented on the announcement made in the city of Paris.
Russian President Vladimir Putin initiated a comprehensive military assault of Ukraine in the early months of 2022, and Russian forces now occupies about 20% of Ukrainian territory.
Sir Keir described the joint statement as "a vital part of our dedication to stand with Ukraine for the foreseeable future".
He continued: "It paves the way for the juridical structure under which allied military personnel could function on Ukrainian soil, protecting Ukrainian airspace and waters, and rebuilding Ukraine's armed forces for the years to come."
The Ukrainian leader praised that accord as a "significant leap of progress".
Twenty-four hours afterward, however, he seemed more cautious.
"I perceive the determination, the political will, and that the allies are prepared, and the allies are willing to give us strong sanctions, powerful defense assurances," 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, backed by the U.S. Congress - this crucial issue cannot be answered. And should they materialize, you still have to rely primarily on your inherent capabilities."
Negotiations in Paris were also significant due to the attendance of US President Donald Trump's peace envoys, Jared Kushner and Steve Witkoff.
Witkoff said the allies "mostly completed" their work on finalizing security arrangements.
Last week, Zelensky said a peace deal was "ninety percent complete".
Questions of land and defense pledges have been at the forefront of outstanding matters for negotiators.
The Russian leader has consistently stated that Ukraine's military must pull back from all of Ukraine's eastern Donbas or Russia will seize it, rejecting any compromise 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 established line - but provided that Russia reciprocated the action.
Russian forces now holds about three-quarters 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.
Ukrainian forces have retaliated at objectives inside Russia with drones, albeit with more limited success.
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