 Complete the following phrase:  Successive attempts to resolve the ongoing war in the Donbas region of Ukraine had seen no result by the start of February 2015. While the Minsk Protocol of 5 September 2014 did significantly reduce fighting in the conflict zone for many months, minor skirmishes continued. At the start of January 2015, the separatist forces of the Donetsk Peoples Republic DPR and Luhansk Peoples Republic LPR began a new offensive on Ukrainian-controlled areas, resulting in the complete collapse of the Minsk Protocol ceasefire. After heavy fighting, DPR forces 