A Russian model and photographer who helps Ukrainian refugees flee the war has been arrested on criminal charges of undermining state security, the independent news website Mediazona reported Friday. Nadezhda Rossinskaya, who goes by the name Nadine Geisler, is accused of posting information about collecting humanitarian aid for the Ukrainian military’s Azov Regiment on Instagram last August. Geisler, 28, denies any affiliation with the Instagram account. Her attorney argues that the since-deleted profile may have been created by individuals who wished “to get rid of people who want to help th…