By Katya Golubkova TOKYO (Reuters) -Oil prices slid more than $1 on Monday as diplomatic efforts grew over the weekend to contain a conflict between Israel and the Palestinian Islamist group Hamas, amid worries of a wider confrontation in the oil-rich region and pressure on supplies. Brent crude futures fell 67 cents to $91.49 a barrel, as of 0203 GMT, having lost $1.02 to $91.14 a barrel earlier in the session. U.S. West Texas Intermediate crude futures lost 72 cents to trade at $87.36 a barrel, after sliding $1.72 to $87.03 a barrel earlier on Monday. The contracts had risen more than 1% las...