Ukrainian President Volodymyr Zelensky says Ukraine's partners in Europe have failed to provide concrete pledges that they will defend Ukraine in the event of a future Russian attack.
"I am asking this very question to all our partners and I have not received a clear, unambiguous answer yet," he told reporters on Wednesday.
His comments come a day after the UK and France signed 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 yet to be solidified. The US, which has been spearheading initiatives to halt the offensive, was reported to have abstained from signing 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 group termed the 'Coalition of the Willing', UK Prime Minister Sir Keir Starmer said the two nations would "set up operational bases across Ukraine" to deter future invasion, while French President Emmanuel Macron subsequently indicated thousands of troops may be sent.
Allies proposed that the US would take the lead in monitoring a truce. But the key issue of ceding land 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.
Russian President Vladimir Putin launched a full-scale invasion of Ukraine in February 2022, and Russian forces now occupies about 20% of Ukraine's land.
Sir Keir described the joint statement as "a vital part of our dedication to stand with Ukraine for the long-term".
He added: "It establishes the pathway for the juridical structure under which allied military personnel could function on Ukrainian soil, protecting Ukrainian airspace and waters, and rebuilding Ukraine's military for the years to come."
The Ukrainian leader praised that agreement as a "significant leap of progress".
A day later, however, he seemed more cautious.
"I perceive the determination, the political resolve, and that the allies are prepared, and the allies are willing to give us robust economic measures, strong security guarantees," he said when questioned if nations in Europe would come to Ukraine's aid.
"But as long as we don't have such security guarantees - formally ratified, supported by parliaments, supported by the United States Congress - this question remains unresolved. And even if they do, you must ultimately depend first and foremost on your own strength."
Negotiations in Paris were also significant owing to the presence of envoys from former President Trump's administration, Jared Kushner and Steve Witkoff.
One envoy stated the allies "mostly completed" their work on finalizing security arrangements.
Last week, Zelensky said a peace deal was "90% ready".
Questions of land and defense pledges have been at the forefront of outstanding matters for diplomats.
Putin has repeatedly warned that Ukraine's military must pull back 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 proposed that Ukraine could redeploy its forces to an established line - but only if Russia did the same.
Russian forces now holds about 75% of the Donetsk region, and some nearly all of the adjacent Luhansk region. The pair of oblasts form the industrial Donbas region.
Attacks have been escalating against Ukrainian cities - with a focus on energy infrastructure. Russia has also made slow progress in seizing additional Ukrainian land.
Ukraine has hit back at objectives inside Russia with drones, albeit with more limited success.
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