President Zelensky has stated that European allies have failed to provide solid assurances that they will protect his country in the case of a new Russian aggression.
"I continue to pose this critical question to every one of our allies and I have not received a definitive and straightforward response yet," he told reporters on Wednesday.
These remarks follow a day after the UK and France inked a statement of purpose on stationing forces in Ukraine if a peace deal to conclude the conflict with Moscow is agreed.
However, comprehensive defense assurances have not been agreed. The United States, which has been spearheading initiatives to end the invasion, reportedly did not sign such a pledge at discussions held in the French capital on Tuesday.
After the Paris talks, which involved some 30 countries that comprise the so-called Coalition of the Willing, UK Prime Minister Sir Keir Starmer said the UK and France would "set up operational bases across Ukraine" to deter future invasion, while France's President Macron later said a significant number of soldiers may be sent.
Partner nations suggested that the US would assume a leading role in overseeing any ceasefire. But the key issue of ceding land that Ukraine is being asked to grant to Russia as part of the peace proposals are continuing to be negotiated.
The Russian government has thus far remained silent on the announcement made in the French capital.
President Putin launched a comprehensive military assault of Ukraine in February 2022, and Russian forces currently controls about one-fifth of Ukraine's land.
Sir Keir described the joint statement as "a vital part of our commitment to stand with Ukraine for the foreseeable future".
He added: "It paves the way for the juridical structure under which British, French and partner forces could operate on Ukraine's territory, protecting Ukrainian airspace and waters, and rebuilding Ukraine's armed forces for the future."
Zelensky hailed that accord as a "huge step forward".
Twenty-four hours afterward, however, he seemed more cautious.
"I perceive the determination, the political will, and that the partners are ready, and the partners are ready to give us robust economic measures, powerful defense assurances," he said when asked if European countries would defend Ukraine.
"However, until we lack such binding security pacts - formally ratified, endorsed by legislatures, backed by the U.S. Congress - this crucial issue cannot be answered. And even if they do, you still have to rely primarily 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.
One envoy stated the allies "largely finished" their work on agreeing security protocols.
Recently, the President indicated a peace deal was "ninety percent complete".
Questions of land and security guarantees have been at the forefront of outstanding matters for negotiators.
Putin has repeatedly warned that Ukrainian troops must withdraw from all of Ukraine's eastern Donbas or Moscow will take control, dismissing potential concessions over how to conclude hostilities.
The Ukrainian President has thus far rejected ceding any territory, but has proposed that Ukraine could withdraw its troops to an established line - but only if Russia did the same.
Russian forces now holds about 75% of the Donetsk oblast, and some nearly all of the adjacent Luhansk region. The pair of oblasts constitute the Donbas industrial heartland.
Attacks have been escalating against cities in Ukraine - particularly targeting power facilities. Russia has also made slow progress in seizing additional Ukrainian land.
Ukraine has hit back at objectives inside Russia with unmanned aerial vehicles, albeit with more limited success.
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