HOUSTON, June 22: Oil prices fell 4 per cent on Monday after U. S. Vice President JD Vance said progress has been made in talks with Iran and that the Strait of Hormuz was open, easing supply concerns. Brent crude was down $3. 18 or 3. 95 per cent, at $77. 39 a barrel by 11: 44 a. m. ET (1544 GMT) Prices had cli



