Ukrainian President Volodymyr Zelensky says European allies have not given him solid assurances that they will defend Ukraine in the case 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.
These remarks follow a day after Britain and France signed a statement of purpose on deploying troops in Ukraine if a peace deal to conclude the conflict with Moscow is finalized.
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 commitment at talks in Paris on Tuesday.
After the Paris talks, which involved some 30 countries that comprise the group termed the 'Coalition of the Willing', British PM Keir Starmer said the UK and France would "set up operational bases across Ukraine" to deter future invasion, while French President Emmanuel Macron subsequently indicated thousands of troops may be deployed.
Allies proposed that the US would take the lead in monitoring a truce. But the key issue of territorial concessions that Ukraine is being asked to grant to Russia as part of the peace proposals are continuing to be negotiated.
The Russian government has not yet commented on the announcement made in the city of Paris.
President Putin initiated a comprehensive military assault of Ukraine in the early months of 2022, and Moscow currently controls about 20% of Ukrainian territory.
The UK Prime Minister characterized the joint statement as "an essential component of our dedication to support Ukraine for the long-term".
He added: "It paves the way for the juridical structure under which British, French and partner forces could function on Ukraine's territory, securing Ukraine's skies and seas, and regenerating Ukraine's armed forces for the years to come."
The Ukrainian leader praised that agreement as a "significant leap of progress".
Twenty-four hours afterward, however, he appeared less optimistic.
"I perceive the determination, the political resolve, and that the partners are ready, 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 binding security pacts - formally ratified, endorsed by legislatures, supported by the United States Congress - this crucial issue remains unresolved. And even if they do, you still have to rely primarily on your inherent capabilities."
Negotiations in Paris were also significant owing to the presence of envoys from former President Trump's administration, Jared Kushner and Steve Witkoff.
Witkoff said the allies "mostly completed" their work on finalizing security arrangements.
Last week, the President indicated a peace deal was "90% ready".
Questions of land and security guarantees have been at the center of outstanding matters for diplomats.
The Russian leader has consistently stated that Ukrainian troops must pull back from the entirety of the Donbas region or Russia will seize it, dismissing potential concessions over how to end the war.
Zelensky has so far ruled out relinquishing any land, but has proposed that Ukraine could redeploy its forces to an established line - but provided that Russia reciprocated the action.
Russian forces now holds about three-quarters of the Donetsk region, and some 99% of the adjacent Luhansk region. The two regions constitute the industrial Donbas region.
It has been intensifying attacks against Ukrainian cities - with a focus on power facilities. Moscow is also achieving slow progress in seizing additional Ukrainian land.
Ukrainian forces have retaliated at Russian targets with drones, though with more limited success.
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