"It has been established that in the period from March 29 to April 4, the command of the 1st (Donetsk) and 2nd (Luhansk) Army Corps of the Russian armed forces, under the guise of training exercises, is planning large-scale provocative shelling of ATO forces to cause the return fire," the report says.

The intelligence says that the purpose of this move is to further accuse the Ukrainian side of violating the Minsk agreements and thus obtain grounds for the offensive.

Read alsoUkraine intel names Russian general heading 'missile forces' in DonbasAs UNIAN reported earlier, the combined Russian-separatist forces attacked Ukrainian army positions in eastern Ukraine 50 times in the past 24 hours, using banned weapons. The situation was most tense near the town of Avdiyivka, where the militants fired mortars and grenade launchers.