This Regional synthesis has been prepared based on national inputs provided by the nominated experts from NOWPAP member states: People’s Republic of China, Japan, Republic of Korea and Russian Federation (hereinafter referred to as China, Japan, Korea and Russia). Results from the regional workshop held in March 2019 in Vladivostok (Russia) have been also taken into account (including views expressed by experts in their presentations). For each of six Ecological Quality Objective (EcoQO) indicators agreed upon earlier, national experts considered their advantages and limitations; data availability; possibility of application; and existence of national numerical targets (standards). Experts’ opinions, reflecting these criteria, are briefly summarized in this report.