By Joseph Salvador The three-time world champion posted a photo on Facebook that showed him in military fatigues. Former world champion boxer Vasiliy Lomachenko has joined a territorial defense battalion in Ukraine as the country continues its ongoing conflict after invasion by Russia. The Ukrainian appears in a Facebook photo in what appears to be a military combat uniform on Sunday. Lomachenko traveled to Greece during the first day of the invasion on Thursday but returned to his home in Odessa to reunite with his family, according to ESPN. Lomachenko, 34, is a two-time Olympic gold medalist…