Efficient implementation of environmental policies is impossible without their understanding and support by local public authorities and communities. But the frozen conflict, which is created on Dniester River in the beginning of 1990th, creates obstacles for any cooperation in public benefit spheres. In such conditions the confidence building is becoming the single way to solve jointly the common challenges appearing in humanitarian spheres (health, environment, education, science etc.). Understanding the importance of stakeholders’ involvement in promotion of interests of the transboundary Dniester River, the group of Moldavian and Ukrainian NGOs in 1999 established the transboundary association with headquarters in Chisinau, Moldova – Eco-Tiras. Initially this registered in Moldova umbrella united eleven eco-NGOs from Moldova and Ukraine, but for now – 50+. From the beginning it became clear that without representation in association of Transdniester region (TR) the main umbrella task – the integrated river basin management could not be applied. But there was no any eco-NGO in this region in that time. The Eco-Tiras started to promote the civil society values in this specific region. In 2001 the first five eco-NGOs were registered, and later – the other 15. In 2003-2015 the everyday work on strengthening of eco-NGO sector in TR was supported by the American National Endowment for Democracy. In the result the eco-NGO community in TR became well prepared for the local problems solution. In 2016-2018, Eco-TIRAS supported by the UNDP Moldova, established the multilateral Environmental Platform of cooperation between local actors from Moldova and TR to identify and start the solution of environmental challenges along the Dniester. The joint community of mayors, NGOs, teachers, youth leaders, businesses, universities (about 100 in total) was created during two years. The community jointly determined the priorities for the cooperation:  Land use and sustainable agriculture. Restoration of pastures and meadows, coastal belts - the transfer of the experience of Moldova to similar structures of TR  Sustainability in agricultural production - continuing the convergence of agricultural innovations, production and technology (research institutes, universities, farmers)  Eco-Network and Natural protected areas of Moldova and TR  Environmental protection - small rivers, forestation.  Water resources, Dniester management and land use efficiency in the Dniester river basin  Establishing and management of Lower Dniester National Park on two banks  Drinking water quality, sanitary conditions improvement. Sewage  Energy efficiency, alternative energy sources, legislation in this area  Utilization of pesticides, toxic chemicals in order to prevent contamination of soil and groundwater. Trainings on the collection and disposal of garbage in villages, explanatory work, best practices from the villages of the two banks. Involvement of the Platform to activities of MD-TR working group on environment and the Dniester River Commission and its working groups activities.