President Zelensky has stated that Ukraine's partners in Europe have not given him solid assurances that they will defend Ukraine in the event of a future Russian attack.
"I am asking this very question to every one of our allies and I have not received a definitive and straightforward response yet," he told reporters on midweek.
His comments come a day after the UK and France inked a declaration of intent on deploying troops in Ukraine should a ceasefire agreement to conclude the conflict with Moscow is finalized.
However, comprehensive defense assurances have yet to be solidified. The US, which has been leading efforts to halt the offensive, reportedly did not sign such a pledge at talks in Paris on the previous day.
After the Paris talks, which included some three dozen nations 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 France's President Macron subsequently indicated thousands of troops may be deployed.
Partner nations suggested that the US would assume a leading role in monitoring a truce. But the central sticking point of ceding land that Ukraine is being pressured to offer to Russia as a component of the settlement terms are continuing to be negotiated.
The Russian government has thus far remained silent on the declaration made in the French capital.
President Putin launched a full-scale invasion of Ukraine in the early months of 2022, and Moscow now occupies about one-fifth of Ukraine's land.
Sir Keir described the bilateral declaration as "an essential component of our commitment to stand with Ukraine for the foreseeable future".
He added: "It establishes the pathway for the legal framework under which British, French and partner forces could operate on Ukraine's territory, protecting Ukrainian airspace and waters, 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 perceive the determination, the political will, and that the allies are prepared, and the partners are ready to give us strong sanctions, powerful defense assurances," he said when questioned if European countries would come to Ukraine's aid.
"However, until we don't have such security guarantees - formally ratified, endorsed by legislatures, backed by the U.S. Congress - this question cannot be answered. And should they materialize, you must ultimately depend first and foremost on your own strength."
The Paris talks were also significant owing to the presence of envoys from former President Trump's administration, Steve Witkoff and Jared Kushner.
Witkoff said the participating countries "largely finished" their work on finalizing security arrangements.
Last week, the President indicated a settlement was "90% ready".
Territorial concessions and defense pledges have been at the center of outstanding matters for negotiators.
Putin has repeatedly warned that Ukrainian troops must withdraw from the entirety of the Donbas region or Russia will seize it, dismissing potential concessions over how to end the war.
The Ukrainian President has thus far rejected relinquishing any land, but has proposed that Ukraine could redeploy its forces to an established line - but only if Russia did the same.
Russian forces currently controls about 75% of the Donetsk oblast, and some 99% of the neighbouring Luhansk. The two regions constitute the Donbas industrial heartland.
It has been intensifying attacks against Ukrainian cities - particularly targeting power facilities. Moscow is also achieving slow progress in seizing additional Ukrainian land.
Ukraine has hit back at Russian targets with drones, though with more limited success.
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