Desaparecidos na Ucrânia

Sydney Ballester, a French national with Spanish origins, served briefly in the French army (152e RI) and arrived in Ukraine by December 2023. He was associated with the Da Vinci Wolves battalion (part of the 67th Mechanized Brigade, later 59th Motorized Infantry Brigade) and linked to another French mercenary, Dylan Devaux. No event type (killed/arrived/captured) is explicitly stated.