Sept. 4 (UPI) -- Leaders of 34 mostly European backers of Ukraine attending a meeting in Paris on Thursday were set to sign off on key security guarantees for their besieged neighbor, including a reassurance force, air patrols and a naval force to neutralize mines menacing Ukrainian shipping.

The so-called "Coalition of the Willing," headed by French President Emmanual Macron and British Prime Minister Keir Starmer, was working through several different scenarios to ensure planning and military preparedness were ready to deal with any eventuality following a cease-fire.

What to do if Russian troops fired on a reassurance force was one of the key unanswered questions being look at by the gathering, which was also attended by Ukrainian President Volodymyr Zelensky, German Chancellor Friedrich Merz, European Commission President Ursula von der Leyen and NATO Secretary General Mark Rutte.

U.S. President Donald Trump sent his special envoy, Steve Witkoff.

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