Oil prices slipped on Monday, pulled down by rising Russian production and the highest U.S. drilling activity in more than three years but supported by concerns over future Iranian and Venezuelan output. Analysts expect higher U.S. output to offset supply curbs by the Organization of the Petroleum Exporting Countries, which have been in place for 18 months and have pushed up prices significantly over the last year. Benchmark Brent crude LCOc1 was down 15 cents at $76.31 a barrel by 0915 GMT. U.S. light crude CLc1 was 10 cents lower at $65.64. The number of new rigs drilling for oil in the United States rose by one last week to 862, its highest since March 2015, data from energy services firm […]