Russia is constantly obstructing the work of the OSCE Special Monitoring Mission (SMM) to Ukraine, U.S. Special Representative for Ukraine Negotiations Kurt Volker has said.

"Russia and its forces routinely block OSCE SMM in violation of its commitments," he wrote on Twitter on Tuesday.

According to him, Russia does not want the world to see that it has created a humanitarian, economic and ecological disaster in Donbas.

Volker also shared a tweet by the OSCE SMM: "OSCE SMM monitors have been once again stopped at the entrance to non-government-controlled Novoazovsk. In the past month, our freedom of movement has been hindered around 40 times in southern parts of non-govt-controlled areas of Donetsk region."