Background: The 2022 War in Ukraine has significantly affected the psychological well-being and daily lives of people in many countries.Objective: Two aims of this transnational study were (1) to compare psychological distress and coping strategies among people living in Ukraine, Poland, and Taiwan, (2) to examine whether the associations between various coping strategies (ie. problem-focused coping, emotion-focused coping, and avoidance) and psychological distress (ie. depression, anxiety, stress, posttraumatic stress disorder symptoms, and hopelessness about the ongoing war) differed among people of various countries during the initial stage of the 2022 War in Ukraine.Method: In total, 1,598 participants (362 from Ukraine, 1,051 from Poland, and 185 from Taiwan) were recruited using an online advertisement to complete online survey questionnaires, including the Brief Coping Orientation to Problems Experienced inventory; the 21-item Depression, Anxiety and Stress Scale; the Impact of Event Scale-Revised; and a questionnaire devised to assess the level of hopelessness about the ongoing war.Results: Psychological distress and adoption of coping strategies differed across people of various countries. Among Taiwanese and Polish respondents, avoidant coping strategies were most strongly associated with all categories of psychological distress compared with problem- and emotion-focused coping strategies. However, the associations of various coping strategies with psychological distress differed to a less extent among Ukrainian respondents. In addition, problem- and emotion-focused coping strategies had comparable associations with psychological distress among the people of Ukraine, Poland, and Taiwan.Conclusions: The 2022 War in Ukraine has affected the psychological well-being of people, especially the Ukrainians. Because of the strong association between the adoption of avoidance coping strategies and psychological distress, despite a less extent among Ukrainian respondents, adaptive coping strategies such as (problem- and emotion-focused) are suggested to help people during times of war.