The aims of our researches is to identify priority directions of the world's cities emerging from the post-Сovid crisis based on an assessment of the Russian cities environment quality before the COVID-19 pandemic. The analysis of the Russian cities ecological sustainability by the beginning of the pandemic COVID-19, component-by-component and complex assessment of quality of the Russian cities environment are done. The urgent need of the existing urboecodiagnostics system changes is explained. Directions of its efficiency and of the objectivity increasing are indicated. The needs of priority steps of development and organization for the post-Сovid cities recovery after the socio-ecological crisis are justified. We resumed that there is an objective problem in integrated assessment of the urban environment quality. The novelty is: it is shown that the only integral, systemic vision of natural, anthropogenic and urban processes, the latest technologies can become the drivers of sustainable urban development.