The paper is devoted to educational process optimization in a multiethnic environment of the university through reduction of destructive distress experiences of students and increasing their subjectivity. Psychological stability and resilience are considered as personal resources in the paper. Much attention is paid to subject identity as a key characteristic of personal subjectivity that resides in the ability to mobilize and distribute one's mental reserves, to achieve self-identity in activities, to properly manage the situation, to strive for satisfaction with the result. The research involves 40 residents of Russia and 25 residents of Syria, Turkmenistan, Ukraine, Moldova, aged 18-22, studying at Adyghe State University. Multiple analyses and data rankings concluded that the main psychological stressors affected students in an innovative educational multi-ethnic environment of the university in the framework of international cooperation include negative impact caused by poorly organized activity, content, form, type of activity, personal characteristics of educational agents, workplace organization and information overload. However, the impact of these stress factors on Russian and international students is different. An important subjective characteristic of students is a subject identity embodied in students' awareness of personal goals, the ability to take decisions under conditions of uncertainty and lack of information, the ability to overcome anxiety and depression. Development of subject identity prevents the internal tension under stress, strengthens stress tolerance and resilience of students. The article is useful for researchers of higher education challenges, university staff, for analysing and organizing the educational process in a multi-ethnic environment. (C) 2019 Published by Future Academy www.FutureAcademy.org.UK