Ukrainian President Volodymyr Zelensky says European allies have failed to provide concrete pledges that they will defend Ukraine 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 clear, unambiguous answer yet," he told reporters on Wednesday.
His comments come a day after Britain and France inked a statement of purpose on stationing forces in Ukraine should a ceasefire agreement to conclude the conflict with Moscow is agreed.
However, full security guarantees have yet to be solidified. 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.
Following the negotiations in Paris, which involved some 30 countries that form the group termed the 'Coalition of the Willing', British PM Keir Starmer said the UK and France would "set up operational bases across Ukraine" to prevent any future incursion, while France's President Macron later said thousands of troops may be deployed.
Allies proposed that the United States would assume a leading role in overseeing any ceasefire. But the central sticking point of territorial concessions that Ukraine is being pressured to offer to Russia as part of the peace proposals are still being discussed.
Moscow has not yet commented on the declaration made in the city of Paris.
President Putin initiated a full-scale invasion of Ukraine in the early months of 2022, and Moscow currently controls about 20% of Ukraine's land.
Sir Keir described the joint statement as "an essential component of our dedication to support Ukraine for the foreseeable future".
He continued: "It paves the way for the juridical structure under which allied military personnel could operate on Ukrainian soil, protecting Ukrainian airspace and waters, and regenerating Ukraine's armed forces for the future."
The Ukrainian leader praised that agreement as a "huge step forward".
Twenty-four hours afterward, however, he appeared less optimistic.
"I perceive the determination, the political resolve, and that the partners are ready, and the partners are ready to give us strong sanctions, strong security guarantees," he said when questioned if nations in Europe would come to Ukraine's aid.
"However, until we don't have such binding security pacts - 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 own strength."
Negotiations in Paris were also notable owing to the attendance of US President Donald Trump's peace envoys, Steve Witkoff and Jared Kushner.
One envoy stated the allies "mostly completed" their work on agreeing security protocols.
Recently, Zelensky said a peace deal was "ninety percent complete".
Questions of land and security guarantees have been at the forefront of outstanding matters for diplomats.
Putin has repeatedly warned 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.
The Ukrainian President has thus far rejected ceding any territory, but has suggested that Ukraine could redeploy its forces to an agreed point - but provided that Russia reciprocated the action.
Moscow now holds about 75% of the Donetsk oblast, and some 99% of the neighbouring Luhansk. The pair of oblasts constitute the industrial Donbas region.
Attacks have been escalating against Ukrainian cities - with a focus on power facilities. Moscow is also achieving slow progress in capturing more Ukrainian territory.
Ukraine has hit back at objectives inside Russia with drones, though with varying degrees of effectiveness.
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