This article describes the history of Ukraine's Montessori Movement and how the Russian invasion has put it in jeopardy. After Ukraine gained its independence in 1991, the Princeton Montessori School and Princeton Center for Teacher Education partnered with Ukrainian educators to set up the model Kyiv Montessori School--the first Montessori school in the country. The success of the model school and the teacher training center, which, by 1997, was formally established and staffed by AMS-credentialed Ukrainian Montessori teachers, led to a positive ripple effect in education over the course of the next 30 years. At the beginning of 2022, there were Montessori schools throughout Ukraine, as well as in many neighboring countries, including Belarus, Russia, and China. However, at the moment that the center was poised for accreditation through AMS, war ripped through the country, violently shattering the positive trajectory that so many children and adults had built and enjoyed for nearly three decades. For the schools that are lucky enough to remain standing, for the present, and for students and teachers who are pushing on despite extreme conditions, there is no security and there are no assurances.