Oil prices were little changed on Tuesday but were headed for their biggest monthly and quarterly losses since the COVID-19 pandemic in early 2020, with investors eyeing potential US-Iran talks in Doha amid a strained interim ceasefire in the four-month-long war. Brent futures fell 13 cents, or 0.2 percent, to USD 73.02 a barrel at 12:34 p.m. EDT (1634 GMT), while US West Texas Intermediate (WT