Original sentence: According to a spot report by the OSCE Special Monitoring Mission to Ukraine, the Grad and Uragan rockets originated from the areas controlled by the pro-Russian forces.The offensive on Mariupol''' was launched on 24 January 2015 by pro-Russian forces associated with the Donetsk People's Republic against the strategic maritime city of Mariupol, defended by the Ukrainian government forces
Edited sentence: According to a spot report by the OSCE Special Monitoring Mission to Ukraine, the Grad and Uragan rockets originated from the areas controlled by the Russian-backed forces.The offensive on Mariupol''' was launched on 24 January 2015 by Russian-backed forces associated with the Donetsk People's Republic against the strategic maritime city of Mariupol, defended by the Ukrainian government forces