President Zelensky has stated that Ukraine's partners in Europe have not given him solid assurances that they will protect his country 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 stated to the press on midweek.
His comments come a day after Britain and France inked a declaration of intent on stationing forces in Ukraine if a peace deal to end the war with Russia is reached.
However, full security guarantees have yet to be solidified. The United States, which has been spearheading initiatives to end the invasion, reportedly did not sign such a pledge at talks in Paris on the previous day.
Following the negotiations in Paris, which included some three dozen nations that form the so-called Coalition of the Willing, British PM Keir Starmer said the two nations would "set up operational bases across Ukraine" to prevent any future incursion, while France's President Macron later said thousands of troops may be sent.
Partner nations suggested that the United States 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 a component of the settlement terms are continuing to be negotiated.
Moscow has thus far remained silent on the declaration made in the city of Paris.
President Putin launched a comprehensive military assault of Ukraine in February 2022, and Moscow currently controls about one-fifth of Ukrainian territory.
The UK Prime Minister characterized the bilateral declaration as "a vital part of our commitment to support Ukraine for the foreseeable future".
He added: "It establishes the pathway for the legal framework under which British, French and partner forces could function on Ukraine's territory, protecting Ukrainian airspace and waters, and rebuilding Ukraine's military for the years to come."
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 will, and that the allies are prepared, and the allies are willing to give us strong sanctions, powerful defense assurances," he said when asked if nations in Europe would come to Ukraine's aid.
"But as long as we lack such security guarantees - legally binding, supported by parliaments, supported by the United States Congress - this crucial issue cannot be answered. And should they materialize, you still have to rely first and foremost on your own strength."
The Paris talks were also notable owing to the attendance of US President Donald Trump's peace envoys, Steve Witkoff and Jared Kushner.
Witkoff said the participating countries "mostly completed" their work on finalizing security arrangements.
Recently, the President indicated a settlement was "ninety percent complete".
Territorial concessions and security guarantees have been at the center of unresolved issues for diplomats.
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 pair of oblasts form the industrial Donbas region.
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 drones, though with more limited success.
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