Oil prices dipped on Tuesday and were poised for a monthly decline, with investors eyeing potential US-Iran talks in Doha amid a strained interim ceasefire in the four-month-old war. Brent August crude futures, which expire on Tuesday, were down 0.9%, or 64 cents, at $72.51 a barrel as of 0356 GMT. These levels are around $20, or 22%, lower than last month’s closing. The more actively trade