OSCE monitors met with the self-proclaimed mayor of Sloviansk, Volodymyr Pavlenko, on 20 June 2014. According to him, sewage systems in Sloviansk had collapsed, resulting in the release of least 10,000 litres of untreated sewage into the river Sukhyi Torets, a tributary of the Seversky Donets. He called this an "environmental catastrophe", and said that it had the potential to affect both Russia and Ukraine.