it appears to have been mutually understood

After the Seige of Perekop, Makhno’s aide-de-camp Grigori Vassilevsky, announced the agreement was over:

That’s the end for the agreement! Take my word for it, within one week the Bolsheviks are going to come down on us like a ton of bricks!

— Grigori Vassilevsky, quoted in the same book