Ukrainian President Volodymyr Zelensky says Ukraine's partners in Europe have failed to provide sound guarantees that they will protect his country in the event 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 signed a statement of purpose on deploying troops in Ukraine should a ceasefire agreement to conclude the conflict with Moscow is finalized.
However, full security guarantees have yet to be solidified. The United States, which has been leading efforts to end the invasion, reportedly did not sign such a pledge at discussions held in the French capital on Tuesday.
Following the negotiations in Paris, which included some three dozen nations that form the group termed the 'Coalition of the Willing', British PM Keir Starmer said the UK and France 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 deployed.
Partner nations suggested that the US would assume a leading role in overseeing any ceasefire. But the central sticking point of ceding land that Ukraine is being pressured to offer to Russia as part of the peace proposals are continuing to be negotiated.
Moscow has not yet commented 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 one-fifth of Ukrainian territory.
Sir Keir described the joint statement as "a vital part of our dedication to stand with Ukraine for the long-term".
He added: "It paves the way for the legal framework under which allied military personnel could operate on Ukraine's territory, securing Ukraine's skies and seas, and regenerating Ukraine's armed forces for the years to come."
Zelensky hailed that agreement as a "huge step forward".
Twenty-four hours afterward, however, he seemed more cautious.
"I see the will, the political resolve, and that the allies are prepared, and the partners are ready to give us strong sanctions, strong security guarantees," he said when asked if European countries would defend Ukraine.
"But as long as we lack such binding security pacts - legally binding, supported by parliaments, supported by the United States Congress - this crucial issue cannot be answered. And even if they do, you still have to rely 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.
Witkoff said the allies "mostly completed" their work on finalizing security arrangements.
Recently, Zelensky said a settlement was "ninety percent complete".
Territorial concessions and defense pledges have been at the center of outstanding matters for diplomats.
Putin has repeatedly warned that Ukraine's military must withdraw from the entirety of the Donbas region or Moscow will take control, rejecting any compromise over how to conclude hostilities.
The Ukrainian President has thus far rejected ceding any territory, but has suggested that Ukraine could withdraw its troops to an agreed point - but only if Russia reciprocated the action.
Russian forces currently controls about 75% of the Donetsk oblast, and some nearly all of the neighbouring Luhansk. The pair of oblasts constitute the Donbas industrial heartland.
Attacks have been escalating 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, albeit with varying degrees of effectiveness.
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