Yes if regular troops are put on the territory held by Ukraine on 24 Feb 2022 and acknowledged by their country or reported on by major western media outlets before 1 Sept 2024. Special operations including French foreign legion will not count, nor will police etc.

Update May 29: "Military instructors" like these articles

https://www.reuters.com/world/europe/ukraine-commander-french-military-instructors-visit-ukrainian-training-centres-2024-05-27/

https://www.lemonde.fr/en/international/article/2024/05/28/france-and-ukraine-in-talks-over-sending-military-instructors_6672883_4.html

talk about will count as "regular troops".