Just to clarify, my outbound is AF-operated via Paris. The return flight from KBP is KL 3097 (operated by UIA 101).
I'm plat with FB. Luggage allowance is showing as 1 hold bag for all flights except the UIA leg, which shows as 0. As it's only a 3 day trip I am considering taking hand luggage only to avoid having a debate with UIA about the luggage policy.