LONDON, April 27 : Oil prices jumped almost 3 per cent on Monday as peace talks between the U.S. and Iran stalled and shipments through the Strait of Hormuz remained limited, keeping global oil supplies tight.  The Brent crude benchmark rose $3, or about 2.9 per cent, to $108.36 a barrel by 0828 GMT, its highest in three weeks. U.S. West Texas Intermediate was up $2.45, or 2.6 per cent, at $96.85. Brent and WTI gained nearly 17 per cent and 13 per cent respectively last week for their biggest