President Zelensky has stated that European allies have failed to provide concrete pledges 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 midweek.
These remarks follow a day after the UK and France inked a statement of purpose on stationing forces in Ukraine should a ceasefire agreement to end the war with Russia is finalized.
However, comprehensive defense assurances have not been agreed. The United States, which has been leading efforts to halt the offensive, was reported to have abstained from signing such a commitment at discussions held in the French capital on the previous day.
After the Paris talks, which included some 30 countries 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 later said a significant number of soldiers may be deployed.
Allies proposed that the United States would take the lead 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.
Moscow has thus far remained silent on the declaration made in the city of Paris.
President Putin initiated a comprehensive military assault of Ukraine in the early months of 2022, and Moscow now occupies about 20% of Ukraine's land.
The UK Prime Minister characterized the bilateral declaration as "an essential component of our dedication to support Ukraine for the long-term".
He added: "It paves the way for the legal framework under which allied military personnel could function on Ukraine's territory, securing Ukraine's skies and seas, and regenerating Ukraine's armed forces for the future."
Zelensky hailed that accord as a "significant leap of progress".
Twenty-four hours afterward, however, he seemed more cautious.
"I see the will, the political resolve, and that the partners are ready, and the allies are willing to give us strong sanctions, strong security guarantees," he said when asked if nations in Europe would defend Ukraine.
"However, until we lack such security guarantees - formally ratified, supported by parliaments, supported by the United States Congress - this question cannot be answered. And even if they do, you must ultimately depend primarily on your inherent capabilities."
The Paris talks were also significant due to the attendance of envoys from former President Trump's administration, Jared Kushner and Steve Witkoff.
Witkoff said the allies "mostly completed" their work on finalizing security arrangements.
Recently, the President indicated a settlement was "ninety percent complete".
Questions of land and defense pledges have been at the center of unresolved issues for negotiators.
The Russian leader has consistently stated that Ukrainian troops must withdraw from all of Ukraine's eastern Donbas or Russia will seize it, rejecting any compromise over how to end the war.
Zelensky has so far ruled out relinquishing any land, but has suggested that Ukraine could withdraw its troops to an agreed point - but only if Russia reciprocated the action.
Russian forces now holds about 75% of the Donetsk oblast, and some nearly all of the neighbouring Luhansk. The pair of oblasts form the Donbas industrial heartland.
It has been intensifying attacks against cities in Ukraine - with a focus on energy infrastructure. Moscow is also achieving incremental advances in capturing more Ukrainian territory.
Ukrainian forces have retaliated at Russian targets with unmanned aerial vehicles, albeit with varying degrees of effectiveness.
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