President Zelensky has stated that Ukraine's partners in Europe have failed to provide concrete pledges that they will defend Ukraine in the case of a future Russian attack.
"I continue to pose this critical question to all our partners and thus far, the answer remains elusive a clear, unambiguous answer yet," he told reporters on midweek.
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 reached.
However, full security guarantees have not been agreed. The US, which has been spearheading initiatives to halt the offensive, 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 form 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 French President Emmanuel Macron subsequently indicated a significant number of soldiers may be sent.
Partner nations suggested 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 asked to grant to Russia as part of the peace proposals 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 comprehensive military assault of Ukraine in the early months of 2022, and Russian forces now occupies about 20% of Ukraine's land.
The UK Prime Minister characterized the joint statement as "a vital part of our dedication to support Ukraine for the long-term".
He added: "It establishes the pathway 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 armed forces for the future."
Zelensky hailed that accord as a "huge step forward".
A day later, however, he seemed more cautious.
"I see the will, the political will, and that the allies are prepared, and the allies are willing to give us robust economic measures, powerful defense assurances," he said when asked 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 cannot be answered. And should they materialize, you must ultimately depend first and foremost on your inherent capabilities."
The Paris talks were also significant owing to the attendance of US President Donald Trump's peace envoys, Jared Kushner and Steve Witkoff.
Witkoff said the allies "largely finished" their work on agreeing security protocols.
Recently, 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 Ukrainian troops must pull back from the entirety of the Donbas region 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 withdraw its troops to an agreed point - but only if Russia did the same.
Russian forces currently controls about three-quarters of the Donetsk region, and some nearly all of the adjacent Luhansk region. The pair of oblasts constitute the Donbas industrial heartland.
It has been intensifying attacks against cities in Ukraine - particularly targeting energy infrastructure. Russia has also made incremental advances in capturing more Ukrainian territory.
Ukraine has hit back at objectives inside Russia with unmanned aerial vehicles, though with more limited success.
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